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Toxic Seahorse

From Mega Man Wiki
Maverick Info
MMX3 - Toxic Seahorse Art.png
Artwork from Mega Man X3.
Stage portrait(s).
General information
Name(s):Toxic Seahorse, Acid Seaforce
Title(s):President of the Water Dragons[1]
Group(s):Doppler Army, Mavericks
Appearances:Mega Man X3
Inspiration:Spiny seahorse
Game Info
Weapon(s):Acid Burst
Weakness(es):Frost Shield
Stage(s):Giant Dam Stage

Toxic Seahorse, known as Acid Seaforce (アシッド・シーフォース) in Japan, is a Maverick from the X era, appearing as one of the main bosses in Mega Man X3. He is an acid-themed Reploid based on a seahorse, who attacks with acid balls and his liquid metal body. He is a stealth Reploid who comes to join the Doppler Army.

In the Games

Mega Man X3

Sprite from Mega Man X3.

Toxic Seahorse debuts in Mega Man X3 as one of the eight Mavericks on the Stage Select screen. He serves as the boss of Giant Dam Stage. The Japanese manual states that he is a Reploid of mysterious origin whose body is composed of liquid metal. He takes over a giant dam that is the water source for a large city, threatening many human lives.[2]

Toxic Seahorse's movements are simple, but his two varieties of bouncing acid balls can be disorienting. Defeating Toxic Seahorse grants X the Acid Burst. His weakness is the Frost Shield, from Blizzard Buffalo, which briefly stuns him. A boss attack rematch with Toxic Seahorse later occurs in Doppler Stage C.

Mega Man X DiVE

In Mega Man X DiVE, Maverick Data of Toxic Seahorse appears as a boss in Co-op and Jakob. His defeat unlocks the Chip for Corrosion.

Other Game Appearances

Other Media

  • In the Rockman X3 manga, Toxic Seahorse reprises his role from Mega Man X3.
  • In the Archie Mega Man comic, Toxic Seahorse appears in the "Worlds Unite" arc as one of the many Mavericks resurrected in Sigma's army.

Official Data

Source Data
Rockman X3 (PS) manual A Reploid made of liquid metal who plans to take over the dam that is the water source of a large city, threatening many human lives. He is a formidable opponent that can not only freely manipulate water, but also disappear by melting into the floor or ceiling.[JP]
Super Famicom Kanpeki Kōryaku Series #123: Rockman X3 Hisshō Kōryaku-hō ...[JP]
Kodansha Manga Hyakka #34: Rockman X Chō Hyakka A Reploid whose entire body is made of liquid metal. This being can melt into the ground to vanish from sight, and can manipulate water at will. He occupies the Monarch Dam, which is the water source for a large city.[JP]
Height: 200~350 cm Weight: 87 kg Max Power: 5800rp Max Speed: 4300rp
Compendium of Rockman X Boss File A Reploid of unknown affiliation. His entire body is made from a fluid metal called "Liquid Metal" and can disappear into the floor or the ceiling. He occupies a dam which is the water source for a metropolis.[JP]
Mega Man X Legacy Collection Gallery The massive Monarch Dam is an important water source in its own right, but it also acts as a hub for remotely controlling many dams at once. Seahorse has taken control of this system to cut off the water supply to human cities. Many will perish of thirst unless he is stopped. Seahorse is unique in that his body is made of a malleable 'liquid metal,' enabling him to blend into the walls and floor to avoid detection. He is also a master of manipulating water. Of course, there's only one way to deal with an enemy who turns into liquid...
Mega Man X DiVE A Reploid composed of special liquified metal can sink into terrain. His acid bomb also has rebound and splash characteristics, which increases the difficulty of avoiding it.


Behind the Scenes

Developer Commentary

"Inafune was the one checking my work on Seahorse. He really twisted my arm on that one, and kept saying 'Make him longer!' Personally, I always thought of seahorses as cute little creatures that are tucked into a compact, little twist shape, but Inafune just kept saying, 'Longer! Longer!' (laughs) I guess Inafune wanted Seahorse to be longer to balance out with the other boss characters, because he kept pushing me and saying, 'I know you can go longer!' (laughs)" - (Tatsuya Yoshikawa)[1]


Language Name Origin
Japanese Acid Seaforce (アシッド・シーフォース) "Seaforce" is a portmanteau of the English words seahorse and force.
English Toxic Seahorse


  1. 1.0 1.1 MM25: Mega Man & Mega Man X Official Complete Works. 2013.
  2. Game manual, Rockman X3. December 1995.