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The Fish Lords (フィッシュロード, Fisshu Rōdo) are using their method of killing is giving their victim a death that seems to look like Diver's Sickness.
Fish Lords[]
Piscis Arapaima[]

Piscis Arapaima
- Main article: Piscis Arapaima
Piscis Arapaima (ピスキス・アラパイマ, Pisukisu Arapaima, 29): Carries a trident named Neptune's Fork (海神の叉, Kaijin no Sa). His first victim was the Mirage Bar's owner, Minoru Sano also known as Isamu Takagi of the Phantom Thieve brothers. As a result, Arapaima was also after Isamu's younger brother/partner, Akira Takagi, who was three days away from taking advantage of the stature of limitations to get the loot he and his brother stole seven years ago. After Akira was finally arrested, Arapaima attacked, forced to fight Agito and G3-X, knocked in midair by Agito Ground Form's Rider Kick so he can be blown up by the GX-Launcher. Voiced by Katsumi Shiono.
Piscis Serratus[]

Piscis Serratus
- Main article: Piscis Serratus
Piscis Serratus (ピスキス・セラトゥス, Pisukisu Seratusu, 35-36): This piranha Unknown attempts to kill Majima, but was stopped by Gills. Serratus was able to overpower Gills, but fell to Another Agito's Assault Kick. Voiced by Hiroyuki Shibamoto.
Appearances[]
Kamen Rider Agito
- Episode 29: A Numerical Mystery?!
- Episode 35: The Mysterious Messiah
- Episode 36: The Fourth Man