This article is about a/an rider in Kamen Rider Agito.
For the A. R. world version, see Shouichi Ashikawa.

Ryo Ashihara (葦原 涼 Ashihara Ryō) is Kamen Rider Gills (仮面ライダーギルス Kamen Raidā Girusu, Masked Rider Gills), a character in Kamen Rider Agito.


He was formerly a star swimmer from Jyohoku University, but Ashihara's future as a swimmer came to an end after a near-fatal car accident. After the car accident, Ryo began to mysteriously undergo a metamorphosis. However, this came at cost of all those closest to him, leaving a signature of resignation to his swimming coach, who began to avoid him out of fear when he demanded to know the nature of leaving the University. Ryo turned to his former girlfriend Mayumi Kitahira for help after avoiding her for three months. But soon enough during the Snake Lords' attempt on Mayumi's life, Ryo underwent the partial evolution into an imperfect form of Agito. This forces him to stay away from Mayumi, who was frightened by his appearance to the point of moving out of town. But because he was an imperfect copy of Agito, Ryo's lack of a stabilizer made his transformation unstable, carrying with it detrimental effects on Ashihara’s body such as cellular decay.

The OverLord found Ryo, prolonging his life for a while longer. After attacking the OverLord out of fear, Ryo learns that his father's body had been found, believed to have died of a nervous breakdown. To learn the truth behind his changes and his father's suicide, Ryo sought answers from the other survivors of the Akatsuki, using his father's black book to find them, starting with Saeko Shinohara, protecting her from the Zebra Lords. During his attempts to kill the Lords, he fell in love with a survivor, Aki, who was killed by the Lords, though by the time Kamen Rider Agito arrived, Ryo came to believe that Agito was her murderer. But furthermore, many of the surviving Akatsuki members came to see Gills as the one out to kill them.

Ryo befriended a boy named Kazuki, whose parents were killed by the Sea Urchin Lord and wanted to evade the truth of what had happened. After seeing Ryo fight as Gills, the boy came to terms with the truth and had Ryo drop him at church to pay his final respects. But while attempting to meet another passenger of the Akatsuki named Masumi; Ryo was attacked by the psychic Sagara and left for dead. However, Ryo was founded by Tetsuya Sawaki, who asked the OverLord to resurrect him like in the past.

But when the OverLord refused, in fear of shortening his life more, Tetsuya attempted to have the newly-awakened Mana Kazaya resurrect him instead. Because of Mana, Ashihara discovered that his body chemistry was also altered; able to now accommodate his transformation. After fighting the Orca Lord, Ryo was found by Tetsuya, who reveals the Lords' fear and Ryo's genetic relation to Agito. Furthermore, he learned of Shouichi's identity as Agito and the truth behind Aki's death.

Eventually, Ryo was forced to fight Kaoru Kino, outmatched by the man's Agito form and forced to run upon being wounded. But Ryo is mysteriously suffering chest pain that would kill a normal person. Taken to the hospital, Kino attempted to use the operation as an excuse to finish the job. But at the last second, Kino lost control over his arm as Ryo awakened, escaping with Majima following. Majima was unable to save Ryo on his own until Tetsuya arrived, allowing him to transfer his Agito power to Ryo. As a result, Ryo obtains the ability to assume Exceed Form. He used his new power to defeat Kino, diving after him. It was that act that reminded Kino of his intent to save lives, leading to his eventual sacrifice.

After Kino's death and with the Lords nowhere to be found, Ryo befriended Risa Mishihara. However, he took her OverLord-induced death hard and attacked the El of Ground, only to be defeated and left for dead. However, Gills arrived to aid Agito and G3-X to finish their fight with the Lords for good. In the epilogue, Ryo left town and is wandering the world with a young puppy.

Kamen Rider Agito: Three Great Riders

Ashihara suddenly reappears out of a cupboard and immediately Makoto and Shouichi try to get him to win the title when talking about Gills' abilities. As a result, Ashihara gets the title but before they can laugh, an alarm goes off, the Unknown have finally arrived. The three Riders waste no time and rush out to stop them.

In the end, Telepi decides that there is no one Ultimate Rider and decides that they should all win. As he says this, the party hat appears over all three pictures of the Riders sitting on Telepi's table.

Kamen Rider Agito Special: A New Transformation

In this special Dr. Kunieda catches up to Shouichi and tells Shouichi that his son committed suicide a half year ago because he could not handle his slow transformation into Agito. Dr. Kunieda tells Shouichi to not lose hope and that "eventually the sky will be clear". Shouichi senses the Unknown and goes to fight with a new found confidence.

All four Riders fight against the Beetle Lord and despite their combined powers cannot defeat it. Agito, in Burning Form, looks up to see a clear blue sky, harnesses the power of the sun, and transcends to Shining Form. Agito, in Shining Form, single handedly defeats the Beetle Lord.

The story ends on a cliffhanger with a mysterious girl going into the G-trailer and stealing data on the G4 project, the events of this would be continued in the movie.

Kamen Rider Agito: Heaven's Door


Exceed Gills and Another Agito appeared to Hikawa's aid when he was attacked by an Agito and a dog-type Unknown but they were easily getting defeated. Luckily Agito/Shouichi Tsugami finally shown up. The real identity of this Agito was Shouichi Maguichi, who was crazed after being blamed for cheating on the programs for using a hidden camera during his childhood. Wanting to cure his sick mind he worshipped the Dog Orphnoch/Dog Lord and was told to feed on the despair of the public. After Agito and the others killed the Dog Lord/Orphnoch, Maguichi/Agito transformed into Mirage Agito out of rage. In a fight with Kamen Riders Agito and Gills, despite gaining the upper hand he was defeated by the strategized use of the Shining Caliber and a Shining Rider Kick. Maguichi was then arrested and was given an unspecified treatment. Kamen Rider Agito: Heaven's Door

OOO, Den-O, All Riders: Let's Go Kamen Riders

  • Kamen Rider Gills returns in OOO, Den-O, All Riders: Let's Go Kamen Riders.
    • Gills isn't shown alongside the secondary Riders when they stand in the cliff around the battlefield, due to his primary suit being damaged by water. However, when the Riders hop to their vehicles and fly towards the Great Leader, Gills is seen on his Gills Raider in the middle of the group, alongside the other Riders as Gills charges straight through the Great Leader's giant body.

Kamen Rider Heisei Generations FOREVER


Kamen Rider Gills appears as a toy, when Sento and Sougo they find Ataru he brings them to his room which is filled with Kamen Rider memorabilia, with Sougo and Sento stunned to see toy versions of themselves. Ataru reveals that Kamen Riders are fictional. 

Appearances in other media

OOO, Den-O, All Riders: Let's Go Kamen Riders: ~Let's Look! Only Your 48 Riders~

Type1. - The Bride of the Child of the Sun!


Kamen Rider  Gills appears with ZO,Garren and V3, according by Urataros. Gills is considered a perfect material for marriage.

Type4. - Quietly Listen! The Tragedy of the 20th Anniversary Rider!!


Kamen Rider Exceed Gills appears with Kabuto Hyper Form,Kiva Emperor and Rising IXA , according by Sieg. Exceed Gills is considered a compatible match.

Type22. - A Man's Lucky Food is Oden!


Kamen Rider Exceed Gills appears with Decade Complete Form,Orga and Chalice Wild Form, according by Momotaros. Exceed Gills is considered a for marriage.

Type41. - Bride of the Super-Extremely Effective Arms!


Kamen Rider Exceed Gills appears with Sasword,Accel and OOO TakaUtah combo, according by Urataros. Exceed Gills is considered a Least compatible match.

Stage Shows

Gaoranger Stage Show at Super Hero Osaka Dome

In a stage show where the Gaorangers are seen fighting their usual foes, the Black Cross FührerIcon-crosswiki, a Lord, and a Gurongi show up and wind up defeating them. The GorengersIcon-crosswiki & Kamen Riders Kuuga, Agito, G3-X, Exceed Gills & 1 arrive to assist the Gaorangers.

Video Game appearances

Kamen Rider Agito & Kuuga Wild Battle


Gills appears with Agito and G3 in Kamen Rider Agito & Kuuga Wild Battle.

Kamen Rider Agito video game


Ryo appears as both Gills and Exceed Gills as a playabled character with Agito and G3 in the Kamen Rider Agito video game.

Kamen Rider: Seigi No Keifu


Gills appears with Agito as his aid in Kamen Rider: Seigi No Keifu.

All Rider Generation 2

Generation girlls2

Kamen Rider Gills appears in the All Kamen Rider: Rider Generation 2‏‎.

Kamen Rider Super Climax Heroes


Kamen Rider Gills appears in the video game with the others Kamen Riders in Kamen Rider Super Climax Heroes.

All Kamen Rider: Rider Revolution


Ryo Ashihara as Kamen Rider Gills, appeared as an unlockable character in this game. His Rider Finisher Ability is Gills Heel Claw.

Kamen Rider Battle Rush

Kamen Rider Gills in the form of Gills Exceed appears as a playable and support character in the video game Kamen Rider Battle Rush using Exceed Heel Claw.

Kamen Rider Battle: Ganbarizing


Kamen Rider Gills card

Kamen Rider Gills is a playable character in Kamen Rider Battle Ganbarizing.

Kamen Rider Gills



Kamen Rider Gills

Gills short horns

Short Horn Gills

KR-Gills Feral state

Kamen Rider Gills Feral state

Rider Statistics

  • Rider height: 200 cm.[1]
  • Rider weight: 100 kg.[1]

Rider Senses:

  • Eyesight: 20 km.[1]
  • Hearing: 20 km.[1]

Ability perimeters (Short Horn → Normal):

  • Punching Power: 1/10 of standard[1] (1 t.) → 10 t.[1]
  • Kicking Power: 1/10 of standard[1] (2 t.) → 20 t.[1]
  • Resistance: 5[1]
  • Maximum Jump Height: 1/10 of standard[1] (5 m.) → 50 m.[1]
  • Maximum Running Speed: 1/10 of standard[1] → 100 m. per 5 sec.[1]

Special Attacks:

  • Gills Heel Claw: 30 t.[1]

Despite possessing an Agito power, Ryo's transforms into an incomplete and feral version of Agito. Despite being imperfect, Gills is physically stronger than Agito and can match him in a one-on-one battle. Gills is also extremely resilient, having survived several near-death injuries. However, the transformation was unstable, causing Ryo's body began to undergo accelerated cellular decay. The damage to his body was severe enough to kill him, though he was revived by the OverLord. After dying a second time and being resurrected by Mana Kazaya, Ryo discovered that his body chemistry was also altered and is now able to accommodate the transformation.

Gills is equipped with an assortment of biological weapons. He is armed with the Gills Claw blades on his wrists and the Gills Heel Claw blades on his heels. He is also able to extend tentacles called the Gills Fillers from his wrists. Gills is able to open his faceplate, revealing the Demon Fang Crusher jaws.

Gills initially had much shorter horns before they grew to their full size during his battle with Anguis Masculus. Gills was later temporarily forced back into this form when he was defeated by the El of the Ground.

With the Gills Heel Claw extended, Gills can deliver his finishing move, in which he leaps into the air and delivers an overhead heel drop with enough power to pierce the enemy's body. He then tears away from the opponent with a flip kick, destroying them. Gills can also perform the Gills Hell Stab attack, which involves Gills pointing out his middle and index fingers and extending them to pierce the opponent's body. This attack was only seen in Kamen Rider Agito: Three Great Riders.

Appearances: Agito Episode 6, 8-9, 12, 16-18, 21, 22, 25-28, 32-35, A New Transformation, Project G4, 36-37, 39-40, Three Great Riders, 41-44, 46-48, 50

Exceed Gills

Kamen Rider Exceed Gills

Rider Statistics

  • Rider Height: 200 cm.[1]
  • Rider Weight: 100 kg.[1]

Rider Senses:

  • Eyesight: 30 km.[1]
  • Hearing: 30 km.[1]

Ability Parameters:

  • Punching Power: 15 t.[1]
  • Kicking Power: 30 t.[1]
  • Resistance: 7[1]
  • Maximum Jump Height: 65 m.[1]
  • Maximum Running Speed: 100 m. per 4.2 sec.[1]

Special Attacks:

  • Exceed Heel Claw: 40 t.[1]
  • Gills Stingers: 50 t.[1]

Gills evolved into Exceed Gills upon receiving Koji Majima's Agito power. Like Agito, the Wiseman's Monolith is now present on his chest. In this form, all of Gills' stats are enhanced, putting him on par with Another Agito.

The Gills Claws have been upgraded into the Exceed Claws and the Gills Heel Claws have been upgraded into the Exceed Heel Claws. In addition, he is also able to extend clawed tentacles called the Gills Stingers from behind his shoulders.

After restraining his enemy with the Gills Stingers, Exceed Gills can extend his Exceed Heel Claws and perform a stronger version of his finisher.

Appearances: Project G4, Agito Episodes 39-40, 42-44, 47-48, 51


  • Meta Factor: Transformation belt
  • Gills Raider: Ryo's personal motorcycle, which transforms along with him due to the power of the Meta Factor.


"(Digital beeping) Gills!"
―Activation announcement[src]

"The evolving Rider who fights with instincts is...Gills! (本能のまま戦い進化するライダーは…ギルスだ! Hon'nō no mama tatakai shinka suru Raidā wa...Girusu da!)"
―Secondary activation announcement[src]

"Armor Time! (Epic rock music, followed by Gills' evolution sounds) Gills!"
―Transformation announcement in the Ziku-Driver's left-hand slot[src]

"Finish Time! Heel Claw Time (Break/Burst)!"
―Finisher announcement in left-hand slot[src]

Gills Ridewatch (ギルスライドウォッチ Girusu Raidowotchi): Based on Kamen Rider Gills, this Ridewatch would provide access to the GillsArmor. It is dated 2001.

Behind the scenes


Ryo Ashihara is portrayed by Yūsuke Tomoi (友井 雄亮 Tomoi Yūsuke). As Kamen Rider Gills, his suit actor was Yoshifumi Oshikawa (押川 善文 Oshikawa Yoshifumi).


Gills Concept Art

Kamen Rider Gills concept Art


  • Gills' helmet is actually his head itself and features a functional fanged jaw, most often seen during feral roaring.
  • Unfortunately, the base Gills suit became too damaged for any use in future installments of the Kamen Rider Series after Agito ended, due to the jaw becoming loose from overuse and has yet to be repaired. This was the reason why the Exceed Gills suit was used in Kamen Rider Decade during the A.R. Agito arc.
  • Since the A.R Agito was originally Gills himself, it is possible Ryo will eventually become a perfect Agito through time.
  • Gills' name is a multi-layered pun; in addition to referencing Ryo being a swimmer, there's an archaic Japanese word for gills, written with the kanji 顎, which is pronounced "agito".
  • Gills was humorously referenced in Ninpu Sentai Hurricaneger: 10 YEARS AFTERIcon-crosswiki, where Ikkou Kasumi (KabutoRaiger)Icon-crosswiki is part of a music group named JUNretsu.  The group mentions that their bandmate Yūsuke Tomoi (Ashihara's actor) is home sick with the measles and "certainly not off fighting monsters as a green superhero".



See also

Icon-agito Kamen Rider Agito
Kamen Riders
Shouichi Tsugami - Makoto Hikawa - Ryo Ashihara - Kaoru Kino - Shiro Mizuki (Movie Exclusive)
Mana Kazaya - Professor Yoshihiko Misugi - Taichi Misugi - Dr. Higashi Kunieda
Tokyo Police Department
SAUL Team: Sumiko Ozawa - Takahiro Omuro
Police: Toru Hojo
The Akatsuki Survivors
Tomoko Miura - Saeko Shinohara - Aki Sakaki - Katsuhiko Sagara - Masumi Sekiya - Koji Majima - Jun Tachibana - Masahide Takashima - Kazuo Ashihara
The Lords
The Els: El of the Water - El of the Wind - El of the Ground
Jaguar Lords - Tortoise Lords - Snake Lords - Crow Lords - Zebra Lords -Jackal Lords - Bee Lords - Stingray Lords - Fish Lords - Lizard Lords - Ant Lords
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