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 Seed 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: 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.

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 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

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 Kamen Rider Super Climax Heroes.

Kamen Rider Gills


Kamen Rider Gills

Rider Statistics

  • Head height: 200cm (6ft 5in)
  • Base weight: 100kg (220.4lbs)

Ability perimeters

  • Punching Power: 10t
  • Kicking Power: 20t
  • Maximum Jump Height: 50m
  • Maximum Running Speed: 100m per 5 seconds
  • Vision: approx. 20km
  • Defense: 5/10

As Gills, Ashihara becomes a truly formidable warrior, with a ferocity that allowed him to rival even Agito. In one-on-one combat, he and Agito's fighting prowess would be considered equal. However, the transformation was unstable and carried detrimental effects to Ashihara’s body. The transformation was so unstable that Ashihara’s body began to degrade from accelerated cellular decay. The cellular damage on his body became so severe that he had died from the effects only to be revived thanks that the intervention of others. He was revived once by the OverLord, then again by Mana Kazaya. However, after being resurrected by Mana Kazaya's supernatural healing power, Ashihara discovered that his body chemistry was also altered; able to now accommodate the transformation.

The Wiseman’s Orb is fitted onto Gills' forehead and he is able to open his faceplate, exposing the Demon Fang Crusher jaws. To aid him in battle, Gills has an assortment of natural weapons. He is equipped with the Gills Claw blades on his forearms 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 extremely resilient, having survived several near-death injuries, including a barrage of specialized bullets designed to subdue Agito,

Gills short horns

"Incomplete" Gills

Gills' initial form, later taken again when defeated by the El of the Ground, featured notably shorter horns. They grew due to rage during his first battle with Anguis Masculus into their full normal size.

Finishing Attacks

  • Gills Heel Claw: With the Gills Heel Claw extended, Gills leaps into the air with a devastating overhead heel drop, with enough power to pierce even the sturdiest of Unknown bodies; from that point, he tears away with a flip kick finisher.
  • Gills Hell Stab: Gills points out his middle and index finger and stabs the enemy piercing right into the foe's body. This attack was only seen in the Kamen Rider Agito Hyper Battle Video 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

  • Height: 200 cm (6 ft. 5 in.)
  • Weight: 100 kg (220.4 lbs.)

Ability Parameters

  • Punching Power: 15t
  • Kicking Power: 30t
  • Maximum Jump Height: 65m
  • Maximum Running Speed: 100m per 4.2 seconds
  • Vision and Hearing: approx. 20km
  • Defense Rating: 5/10

Ashihara discovered this evolved form thanks to the sacrifice of Koji Majima. Koji relinquished his Seed of Agito to rejuvenate Ashihara, and activated the Exceed Gills form.

Gills Stingers

Gills Stingers beginning to extend

In this form, the blades on Gills' forearms are upgraded into the Exceed Claws and the blades on his heels are upgraded into the Exceed Heel Claws. In addition, he is now able to extend clawed tentacles called the Gills Stingers from behind his shoulders.

Finishing Attacks

  • Exceed Heel Claw: Restricting his enemy with the Gills Stingers, Exceed Gills performs the Gills Heel Claw attack, tearing the enemy in two with the devastating force of his overhead heel drop. Possesses approx. 45 tons of force.

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


  • Meta Factor: seed & transformation belt, mounted around waist in transformed state.
  • Gills Raider: Ryo's personal motorcycle, which changes along with him due to the power of the Meta Factor.

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' 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".


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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