List of Kamen Rider Agito characters


Kamen Rider Agito is a Japanese tokusatsu series that serves as the 11th entry in the Kamen Rider franchise and the second entry in the Heisei era. It is also served as an indirect sequel to Kamen Rider Kuuga.

Main characters

Shouichi Tsugami

Shouichi Tsugami is the series protagonist. He suffers from amnesia and uses the name from a letter found in his possession. Living with the Misugi family, he performs household chores. Despite his amnesia, he typically displays an optimistic personality and has a fondness for gardening, cooking, and dad jokes. He later remembers that his true identity is Tetsuya Sawaki, a former culinary school student, with his current alias actually being the name of his late sister's boyfriend. After the Overlord's defeat, Shouichi opens a restaurant named after his Rider identity. Years later, during the events of Kamen Rider Zi-O, Restaurant Agito has become a franchise. Shouichi personally manages a location in Paris, France.
Utilizing the Altering belt, Shouichi can transform into Kamen Rider Agito, a powerful warrior whose abilities evolve through the Wiseman Monolith embedded in his chest. His personal vehicle is the Machine Tornador motorcycle, which is converted from his Honda VTR1000F and can assume an alternate hoverboard-like Slider Mode. As Kamen Rider Agito, much like his predecessor Kamen Rider Kuuga, Shouichi can assume different forms by pressing the switches on either side of the Altering, which are as follows:
  • Ground Form: Shouichi's gold-colored default form accessed by simultaneously pressing both switches on the Altering that specializes in hand-to-hand combat. His finishers in this form are the Rider Kick and the Rider Punch, which he can perform when the Cross Horn crest on his head opens.
  • Storm Form: A blue-colored auxiliary form accessed by pressing the left-hand switch on the Altering that channels the element of wind into Shouichi's left arm. In this form, he wields the Storm Halberd, which allows him to perform the Halberd Spin finisher when the Drag Storm blades open.
  • Flame Form: A red-colored auxiliary form accessed by pressing the right-hand switch on the Altering that channels the element of fire into Shouichi's right arm. In this form, he wields the Flame Saber, which allows him to perform the Saber Slash finisher when the Saber Horn crossguard opens. He can also produce a second Flame Saber to dual wield and perform the stronger Double Saber Slash finisher.
  • Trinity Form: A tricolored fusion form only accessible when Shouichi's memories are temporarily restored that combines the powers of his three main forms, allowing him to dual wield the Storm Halberd and Flame Saber. His finishers in this form are the Rider Shoot via the Altering and the Fire Storm Attack via the Storm Halberd and Flame Saber.
  • Burning Form: Shouichi's crimson-colored super form that grows stronger as his fury increases, which initially makes it difficult to control. In this form, he wields the double-bladed Shining Caliber sword in its one-piece Single Mode. His finishers in this form are the Burning Rider Punch via the Altering and the Burning Bomber via the Shining Caliber.
  • Shining Form: Shouichi's silver-colored final form that he first assumes after mastering Burning Form and subsequently being exposed to direct sunlight, causing his armor to molt. Initially, he could only access this form by first assuming Burning Form and then basking in sunlight, but by the time of the final battle, he displays the ability to transform directly into this form. In this form, he dual wields the Shining Caliber in its two-piece Twin Mode. His finishers in this form are the Shining Rider Kick via the Altering and the Shining Clash via the Shining Caliber.
Shouichi also wears the Kamen Rider G3-X suit on one occasion, successfully proving its effectiveness against the Unknown. During the events of Kamen Rider Zi-O, Shouichi briefly dons a mass-produced Kamen Rider G3 suit when his Agito powers are temporarily lost.
Shouichi Tsugami is portrayed by Toshiki Kashu.

Makoto Hikawa

Makoto Hikawa is a clumsy yet capable police officer and hero of the Akatsuki incident. As a member of the Tokyo Metropolitan Police Department's SAUL unit, he becomes Kamen Rider G3 using the G3 System originally developed to fight the Gurongi, which the M.P.D. knew as the Unidentified Lifeforms, and modeled after Unidentified Lifeform #4. Makoto is the first to suggest that the Unknown are targeting humans with supernatural powers, though this theory is often dismissed by his superiors. Makoto is also the first person to learn of Mana's special abilities. Having witnessed Shouichi as Kamen Rider Agito fight and save people several times, Makoto staunchly supports Agito as an ally of humanity even before learning of his true identity. After the Overlord's defeat, Makoto returns to being a normal police officer.
As G3, Makoto wields a variety of armaments, including the GM-01 Scorpion handgun, the GG-02 Salamander grenade launcher, the GS-03 Destroyer sword, and the GA-04 Antoures grappling hook. His personal vehicle is the Guard Chaser motorcycle, which is based on Kamen Rider Kuuga's Try Chaser 2000 and Beat Chaser 2000. The Guardacceler, which normally serves as the Guard Chaser's grip/key, can also be used as a baton.
As the G3 System was specifically designed to fight the Gurongi, G3 often struggles against the Unknown. Because of this, Sumiko Ozawa eventually develops the upgraded Kamen Rider G3-X suit. The G3-X System is overall more powerful than its predecessor and is equipped with a support AI that assists the operator. When first deployed, G3-X is considered a "perfect system," but Makoto's brute force approach clashes against the AI's precise calculations, causing G3-X to operate erratically and injure Makoto until Ozawa installs a dampener chip. As G3-X, Makoto wields the GX-05 Kerberos Gatling gun and the electromagnetic GK-06 Unicorn dagger in addition to his previous equipment. The GX-05 Kerberos can be used in either its standard Vulcan Mode or combined with the GM-01 Scorpion and a GX Bullet to form the GX Launcher rocket launcher.
Makoto Hikawa is portrayed by Jun Kaname.

Ryō Ashihara

Ryō Ashihara is a former star swimmer and university student who, after a near-fatal motorcycle accident, develops the ability to become Kamen Rider Gills, a flawed and unstable form of Agito with a wild and aggressive fighting style. As Kamen Rider Gills, he rides the Gills Raider motorcycle and can perform the Gills Heel Claw and Gills Hell Stab finishers. He is able to grow Gills Claws and Gills Filler tentacles from his forearms. His father was a passenger on the Akatsuki and committed suicide after the incident. Ryō discovers the passenger manifest in his father's personal effects and begins tracking down the survivors seeking the truth behind his father's death. After dropping out of university and being abandoned by his swimming coach and girlfriend out of fear of his transformation into Gills, Ryō becomes a brooding wanderer. He eventually develops feelings for Aki Sakaki and, when she is killed by Pantheris Magistra, Ryō believes Agito to be her killer. The misunderstanding causes Agito and Gills to fight several times before they discover each other's identities. Because of Gills' flawed nature, Ryō initially experiences increasing cellular breakdown every time he transforms, but after he is killed by Katsuhiko Sagara and later resurrected by Mana's regenerative power, transforming no longer harms him. He later receives Koji Majima's seed of Agito, which grants him the ability to become the evolved Kamen Rider Exceed Gills, which can perform the Exceed Heel Claw finisher and can extend the Gills Stinger tentacles from his back. After the Overlord's defeat, he encounters a young puppy and continues to wander the world.
Ryō Ashihara is portrayed by Yūsuke Tomoi.

Mana Kazaya

Mana Kazaya is the daughter of Nobuyuki Kazaya and Yoshihiko Misugi's step-niece. She possesses a seed of Agito, which initially grants her clairvoyance. Once her powers are fully awakened by "Tetsuya Sawaki," she gains a regenerative power that she uses to resurrect Ryō, though the strain of doing so causes her to lose this power.
Mana Kazaya is portrayed by Rina Akiyama. As a child, Mana is portrayed by Satomi Tanimura.

Recurring characters

Yoshihiko Misugi

Yoshihiko Misugi is a psychology professor and lives with his son, Mana, and Shouichi. He is also Sumiko Ozawa's former professor.
Yoshihiko Misugi is portrayed by Takeshi Masu.

Taichi Misugi

Taichi Misugi is Yoshihiko's son.
Taichi Misugi is portrayed by Tokimasa Tanabe.

Metropolitan Police Department

The Tokyo Metropolitan Police Department created SAUL to combat unknown threats.

Sumiko Ozawa

Sumiko Ozawa is the genius behind the G3 System. Her position within SAUL's G3 unit is the system's monitor engineer, overseeing the operator and G3 suit during combat from the G-Trailer mobile command base. She later develops the G3-X system and designs the G4 system, but shelves the latter when it proves too dangerous for humans to use. Because of her blunt and unfeminine personality, Sumiko frequently comes into conflict with her colleagues in the MPD, especially Tōru Hōjō, and has great faith in Makoto's abilities as G3's operator. After the Overlord's defeat, she leaves the police force and becomes a professor at the University of West London.
Sumiko Ozawa is portrayed by Toko Fujita.

Takahiro Omuro

Takahiro Omuro is Sumiko's assistant at the G-Trailer mobile command base. He frequently serves as comic relief, being more laid-back and carefree than his colleagues. After the Overlord's defeat, he becomes the squad leader of the G5 Unit. By the time of Kamen Rider Zi-O, Omuro has become commander of the G3 Team, which utilizes mass-produced G3 suits.
During the events of the special Kamen Rider Agito Special: A New Transformation, Takahiro becomes the test operator of Kamen Rider G3 Mild, a prototype for a mass-production version of Kamen Rider G3. Late in the series, when the G3 Unit is restructured to hunt Agitos instead of the Unknown, Takahiro is briefly assigned as Kamen Rider G3's operator.
Takahiro Omuro is portrayed by Akiyoshi Shibata

Tōru Hōjō

Tōru Hōjō is an assistant inspector and Makato's rival, having been the original candidate for G3. Hōjō's resentment from believing Makoto was only selected due to being the hero of the Akatsuki incident drives him to carry out several schemes to either replace Makaoto as G3 or get the G3 Unit shut down by proving its ineffectiveness. His schemes succeed at times, once being briefly assigned as G3's operator before abandoning the suit and fleeing in cowardice during a battle with an Unknown. Toru also creates and executes a plan to capture Agito, which instead leads to the squad encountering Ryō as Gills. He later creates the Victory-1 System in a bid to surpass G3-X, but his suit is quickly damaged beyond repair when G3-X's support AI goes haywire. Hōjō eventually shifts his focus to discovering why the Unknown are killing people, in the process discovering Shouichi's identity and the truth behind Nobuyuki Kazaya's death. Late in the series, after a month with no Unknown attacks, Toru develops a fear of the Agito, believing they will eventually outnumber humans and take over the world. Under his recommendation, the G3 Unit is restructured to hunt the Agito, assigning Toru as G3-X's operator. However, Sumiko and Makoto soon forcefully take the equipment from him to confront the Overlord. Despite his constant antagonism of the G3 Unit, Toru is otherwise noted to be a capable and dedicated police officer.
Tōru Hōjō is portrayed by Jun Yamasaki.

Kōji Kōno

Kōji Kōno is Tōru Hōjō's boss. He investigates the Nobuyuki Kazaya murder case and frequently invites his colleagues out for ramen.
Kōji Kōno is portrayed by Kazumasa Taguchi.

Sakiko Mikumo

Sakiko Mikumo is a researcher in charge of the OOPArts Research Department established within SAUL who solves the puzzle artifact containing the Overlord's DNA. She is killed by Anguis Femineus.
Sakiko Mikumo is portrayed by Ryoko Takizawa.

Lord Monsters

The Lord Monsters, labeled as "Unknowns" by the police, are a group of powerful disciples serving under the Overlord. They attack humans with the potential to evolve into an Agito, seeing them as a threat to the Overlord, particularly the survivors of the Akatsuki incident and their family members. They perform a distinctive ritual hand gesture before attacking.
  • Pantheras Luteus: A leopard-themed Jaguar Lord. He is destroyed by Agito. Voiced by Jin Yamanoi.
  • Pantheras Albus: A snow leopard-themed Jaguar Lord. He is destroyed by Agito. Voiced by Jin Yamanoi.
  • Pantheras Tristis: A black panther-themed Jaguar Lord. He is destroyed by Agito. Voiced by Jin Yamanoi.
  • Testudo Oceanus: A sea turtle-themed Tortoise Lord. He is destroyed by Agito.
  • Testudo Terrestris: A tortoise-themed Tortoise Lord. He is destroyed by G3.
  • Anguis Masculus: A cobra-themed Snake Lord. He is destroyed by Gills. Voiced by Hiroyuki Shibamoto.
  • Anguis Femineus: A venomous snake-themed Snake Lord. The Overlord telekinetically forces Femineus to kill herself for breaking the taboo of taking the life of a normal human. During the events of the Hyper Battle Video special Kamen Rider Agito: Three Great Riders, she is destroyed by Agito. Voiced by Mako Hyōdō.
  • Corvus Croccio: A Crow Lord. He is destroyed by Agito. Voiced by Katsumi Shiono.
  • Mollipes Octipes: An Octopus Lord. He is destroyed by Agito. Voiced by Yoshimasa Chida.
  • Equus Noctis: A Zebra Lord. He is destroyed by Agito.
  • Equus Dies: A Zebra Lord. He is destroyed by Gills.
  • Leiurus Acutia: A Scorpion Lord. He is destroyed by Agito. Voiced by Shigenori Sōya.
  • Skelos Falx: A Jackal Lord. He is destroyed by Agito. During the events of the Hyper Battle Video special Kamen Rider Agito: Three Great Riders, he is destroyed by G3-X. Voiced by Yoshimasa Chida.
  • Hydrozoa Ignio: A jellyfish-themed Hydrozoa Lord. He is destroyed by Agito. During the events of the Hyper Battle Video special Kamen Rider Agito: Three Great Riders, he is destroyed by Gills. Voiced by Masaharu Satō.
  • Pantheras Cyaneus: A Jaguar Lord. He is destroyed by Agito. Voiced by Shigenori Sōya.
  • Pantheras Rubeo: A Jaguar Lord. He is destroyed by Gills. Voiced by Shigenori Sōya.
  • Pantheras Magistra: The Queen Jaguar Lord. She is destroyed by Agito. Voiced by Hiromi Nishikawa.
  • Apis Vespa: A wasp-themed Bee Lord. He is destroyed by Agito. Voiced by Katsumi Shiono.
  • Apis Mellitus: A honey bee-themed Bee Lord. She is destroyed by G3-X. Voiced by Yumi Takada.
  • Potamotrigon Cucullus: A skate-themed Stingray Lord. He is destroyed by G3-X. Voiced by Katsumi Shiono.
  • Potamotrigon Cassis: A manta ray-themed Stingray Lord.
  • Corvus Luscus: A Crow Lord. He is destroyed by Agito. Voiced by Yoshimasa Chida.
  • Corvus Intonsus: The Queen Crow Lord. She is destroyed by Agito. Voiced by Chizu Yonemoto.
  • Corvus Calvus: A Crow Lord. He is destroyed by Agito. Voiced by Yoshimasa Chida.
  • Echinus Famelicare: A Sea Urchin Lord. He is destroyed by Gills. Voiced by Jin Yamanoi.
  • Piscis Arapaima: An arapaima-themed Fish Lord. He is destroyed by G3-X. Voiced by Katsumi Shiono.
  • Crustata Palleo: A Crab Lord. He is destroyed by Agito. Voiced by Ryōichi Tanaka.
  • Cetos Orcinus: A Orca Lord. He is destroyed by Agito. Voiced by Toshihide Tsuchiya.
  • El of the Water: A whale-themed El Lord. He is defeated by Agito, returning to the Overlord's body to recuperate and undergo an evolution. He is ultimately wounded by Agito, Exceed Gills, and Another Agito before being unable to return to the Overlord's body in time, and is reduced to a puddle of water. Voiced by Kiyoyuki Yanada.
  • Propheta Cruentus: A Mantis Lord. He is destroyed by Agito. Voiced by Toshihide Tsuchiya.
  • Corvus Canosus: A Crow Lord. She is destroyed by Gills. Voiced by Toko Fujita, who also portrays Sumiko Ozawa.
  • Piscis Serratus: A piranha-themed Fish Lord. He is destroyed by Another Agito. Voiced by Hiroyuki Shibamoto.
  • Stellio Dextera: An iguana-themed Lizard Lord. He is destroyed by Agito. Voiced by Masaharu Satō.
  • Stellio Sinistra: An iguana-themed Lizard Lord. He is destroyed by G3-X. Voiced by Masaharu Satō.
  • Skelos Glaucus: A Jackal Lord. He is destroyed by G3-X. Voiced by Hiroyuki Shibamoto.
  • Volucris Ulucus: An Owl Lord. He is destroyed by Agito. Voiced by Keikō Sakai.
  • Volucris Falco: A Falcon Lord. He is destroyed by G3-X. Voiced by Toshihide Tsuchiya.
  • Ericius Liquor: A porcupine-themed Hedgehog Lord. He is destroyed by Agito, Exceed Gills, and Another Agito. Voiced by Hitoshi Horimoto.
  • El of the Wind: A hawk-themed El Lord. He is destroyed by G3-X and Exceed Gills. Voiced by Kujira.
  • El of the Ground: A lion-themed El Lord. He is mortally wounded by Agito, renergized and strengthened by the Overlord. He is ultimately destroyed by Agito. Voiced by Kenta Miyake.

Other Lord Monsters

  • Scarabaeus Fortis: A Japanese rhinoceros beetle-themed Beetle Lord who appears exclusively in the special Kamen Rider Agito Special: A New Transformation. He is destroyed by Agito. Voiced by Shigenori Sōya.
  • Formica Pedes: Ant Lords who appear exclusively in the film Kamen Rider Agito the Movie: Project G4. numbers of them are destroyed by Agito, G3-X, Gills, and G4. Voiced by Kunihiko Yasui, Yuuki Anai, Yoshio Nomura, Koichi Terasawa, JOE, Katsumi Shiono.
  • Formica Eques: An Ant Lord who appears exclusively in the film Kamen Rider Agito the Movie: Project G4. He is destroyed by Exceed Gills. Voiced by Hiroyuki Shibamoto.
  • Formica Regia: The Queen Ant Lords who appears exclusively in the film Kamen Rider Agito the Movie: Project G4. She is destroyed by Agito. Voiced by Hiromi Tsuru.

Overlord

The Overlord, real name Theos, also known as the Mysterious Youth and the Power of Darkness, is the master of the Unknowns and the creator of the human race. He seeks to kill all humans who possess the potential to evolve into Agito. He ultimately implies that he will postpone his plans and observe how humans use their own gifts and whether or not they are worthy of existence.
The Overlord is portrayed by Rei Haneo. As a baby and child, he is portrayed by Yuuki Yagi, Ryunosuke Kamiki, and Takafumi Anai.

Nobuyuki Kazaya

Nobuyuki Kazaya was Mana's father and Yoshihiko Misugi's step-brother. He was also an acquaintance of the original Shouichi Tsugami and Yukina Sawaki's college professor. Obsessed with Yukina's supernatural powers, he conducted a series of experiments on her with Tsugami's help. This eventually led to his accidental death at Yukina's hands.
Nobuyuki Kazaya is portrayed by Tōru Nakane.

''Akatsuki'' survivors

The Akatsuki is a ship where the Power of Light's spirit mysteriously appeared and gave the seed of Agito to the passengers and the captain before Hikawa saved them.
  • Tomoko Miura: A passenger who was murdered by the Overlord. Portrayed by Mahiro Morishita.
  • Saeko Shinohara: A passenger and Tomoko's friend. The trauma of the Akatsuki incident made her catatonic until her brother started planting fake artifacts in a nearby lake for her to excavate, which she connected to the story of an ancient Agito-like warrior. She is attacked by Equus Dies and drowns. Portrayed by Nana Nakamoto.
  • Aki Sakaki: A passenger. She is sent by fellow Akatsuki survivors to investigate Shouichi, claiming to be a housekeeper sent by Professor Misugi and Shouichi's former lover to get closer to him. She eventually begins to display potent telekinesis, which grows in strength over time. After meeting and developing feelings for Ryō, a combination of her evolving powers and witnessing Ryō as Gills being attacked by the MPD's Agito capture team drives her to homicidal madness. Pantheras Magistra murders her, though Ryō arrives at the scene too late and assumes Agito is her killer. Portrayed by Masako Sakuma.
  • Katsuhiko Sagara: A passenger. He eventually develops powerful telekinesis and regenerative abilities and successfully kills Ryō out of paranoia when his abilities are enhanced by "Tetsuya Sawaki." He also attempts to convince Mana that her powers are evolving beyond her control in a scheme to isolate her and sway her to the Akatsuki survivors' side. He is murdered by Crustata Palleo. Portrayed by Takahiko Tatsuke.
  • Masumi Sekiya: A passenger. Paranoid and unfriendly, she served as a host to the El of the Water until he gathered enough energy to leave her body, fatally depleting her life-energy as a result. Portrayed by Kami Hiraiwa.
  • Kōji Majima: A passenger who came from a line of doctors who was disowned by his family for not following the same path. He gives Ryō his seed of Agito, which allows him to evolve into Exceed Gills. After the Overlord's defeat, Majima decides to give becoming a doctor another try, having been inspired by Kino's sacrifice. Portrayed by Yoshikazu Kotani.
  • Jun Tachibana: A passenger and Masumi's friend. She is murdered by Masumi when the latter is under the El's influence. Portrayed by Urara Tsushima.
  • Masahide Takashima: The Akatsukis captain. He is murdered by Masumi when the latter is under the El's influence. Portrayed by Shoji Maruoka.
  • Kazuo Ashihara: A passenger and Ryō's father. Experiencing a mental breakdown, he commits suicide, leaving Ryō his personal effects, which include a list of the Akatsukis passengers. Portrayed by Junpei Takemoto.

Kaoru Kino

Kaoru Kino is an unlicensed surgeon and a leader figure to the Akatsuki survivors who is able to transform into a twisted form of Agito known as Another Agito. His brother Masato died in a mountain-climbing accident during a snowstorm, with Kino losing an arm to severe frostbite in the same event. His brother's arm was grafted on to replace the one he lost, which caused his medical license to be revoked. The arm causes him frequent pain he believes to be Masato's spirit trying to influence him. Despite now being unlicensed, Kino is frequently hired by local hospitals because of his skills, once successfully performing two difficult surgeries simultaneously. Already traumatized by his brother's death, Kino's awakened Agito powers further worsen his mental state, causing him to develop a Messiah complex where he believes himself to be the only Agito the world needs. This delusion brings him into conflict with the other Riders several times until he is defeated by the newly evolved Exceed Gills and humbled. From then on, he becomes an ally to the other Riders, even once performing surgery on Shouichi to remove Ericius Liquor's venomous quill. He is severely injured in a battle with Volucris Falco and eventually dies from his injuries, with his last thought being a fantasy where he successfully saves his brother. As Another Agito, Kino rides the Dark Hopper motorcycle. When his power reaches its peak, the Crusher jaw opens, allowing him to perform the Assault Kick finisher.
Another Agito is sometimes referred to as Kamen Rider Another Agito to differentiate from the Another Agito that appears in Kamen Rider Zi-O.
During the events of the web-exclusive crossover series Kamen Sentai Gorider, Kino becomes Mido-Rider, the green-colored member of Kamen Sentai Gorider.
Kaoru Kino is portrayed by Takanori Kikuchi.

"Tetsuya Sawaki"

"Tetsuya Sawaki", in truth, the real Shouichi Tsugami, is a man resurrected by the Overlord due to his passive involvement in the death of the first Agito, Yukina Sawaki. He was romantically involved with Yukina and tried to stop her from committing suicide, but ultimately allowed her to plummet to her death. The guilt drove him to commit suicide afterwards. After the Overlord resurrects him, he adopts the name of Yukina's younger brother and requests power from the Overlord. The Overlord complies by granting him a portion of his power, which manifests as telepathy and the ability to accelerate the evolution of Agito seed bearers. He soon turns against the Overlord when he realizes what the Overlord's ultimate plan is, using his abilities to help the Agito seed bearers nurture and evolve their powers. He eventually manages to redeem himself by saving Kana before the Overlord grants him his rest to view mankind's future alongside him.
"Tetsuya Sawaki" is portrayed by Atsushi Ogawa.

Yukina Sawaki

Yukina Sawaki was Shouichi's older sister, who committed suicide out of fear after discovering she was becoming the very first Agito. She was involved in the paranormal research conducted by Professor Kazaya at Jyohoku University; this resulted in severe trauma and led her to unconsciously kill Nobuyuki Kazaya.
Yukina Sawaki is portrayed by Ayumi Kasama.

Kana Okamura

Kana Okamura is a part-time chef whom Shouichi meets when he gets a job at his old professor's restaurant after the Unknown attacks stop. Though she dreams of being a chef like her father, she is shown to be clumsy and a poor cook, which causes her to get fired frequently. Her father was murdered by an Unknown, meaning Kana herself is an Agito close to awakening. Fear of her transformation causes her to attempt suicide, but Shouichi and "Sawaki" manage to save her in time, encouraging her to keep living.
Kana Okamura is portrayed by Eriko Moriwaki.

Risa Mizuhara

Risa Mizuhara is a delinquent motorcyclist who was once a star runner in high school before an injury ostracized her from her former teammates. She turned to reckless street racing in order to run away from her past, which gained her a reputation as the outlaw biker "Scorpion." Ryō meets her while he is working part-time at a motorcycle shop after the Unknown attacks stop. He eventually befriends her and helps her make peace with her past. However, she becomes one of the victims of the Overlord's culling of humans born under the Scorpio sign, dying in front of Ryō just as they meet to celebrate his birthday.
Risa Mizuhara is portrayed by Mina Mizuki.

Spin-off exclusive characters

Azuma Kunieda

Azuma Kunieda is a psychologist and friend of Yoshihiko Misugi. He nursed Shouichi back to health after he washed ashore and would later place him in the care of Yoshihiko Misugi. A year later, he visits the Misugi household to catch up with Shouichi, who has to quickly leave when he senses an Unknown, with Kunieda following to watch the battle. Shouichi soon attacks Kunieda when he loses control in Burning Form, causing Shouichi to flee in fear of his powers. Catching up to Shouichi, Kunieda reveals that his son also began evolving into an Agito and committed suicide because of it. Kunieda restores Shouichi's confidence by telling him not to lose hope and reminding him of the clear skies he saw while in the hospital, which allows Shouichi to fully master Burning Form's power and evolve into Shining Form.
Azuma Kunieda is portrayed by Masaki Kyomoto.

Sayaka Kahara

Sayaka Kahara is a girl with the psychic ability of clairvoyance. She came from a wealthy family and lived relatively well until she was orphaned during a car crash, which killed the rest of her family. She entered the research study at the Japan Ground Self-Defense Force's psychic educational facility as a candidate psychic for the G4 project.
Sayaka Kahara is portrayed by Akane Kimura.

Rei Motoki

Rei Motoki is a boy gifted with psychic abilities. He, like most children in the Japan Ground Self-Defense Force's psychic educational facility, was orphaned at a young age.
Rei Motoki is portrayed by Rikiya Otaka.

Risa Fukami

Risa Fukami is a captain of the Japan Ground Self-Defense Force. Assigned to the G3 Unit, she steals the data of the G4 System from Ozawa's computer to create the G4 suit, intending to continue the JSDF's experiments and mass-produce the G4 System. She is mauled to death by the Ant Lords.
Risa Fukami is portrayed by Maju Ozawa.

Shiro Mizuki

Shiro Mizuki is a second lieutenant of the Japan Ground Self-Defense Force. A jaded man obsessed with the concept of embracing death, he becomes Kamen Rider G4, wielding the GM-01 Custom Type 4 handgun and the large Gigant missile launcher. Ozawa originally shelved the G4 system after deeming it too dangerous for normal humans, as it uses the mind of a person with psychic abilities as the basis for its onboard predictive AI, making it more powerful than the one installed on G3-X. This system places intense strain on the suit's operator with extended use, which killed several prior test subjects and ultimately leads to Mizuki's own death as he battles Makoto in G3-X. The suit's AI takes over soon afterward, attempting to rise and continue the battle, but Makoto destroys it for good.
Shiro Mizuki is portrayed by Ryo Karato.