Moonfish

Moonfish (ムーンフィッシュ) is a villain affiliated with the League of Villains and also part of its Vanguard Action Squad. He and the rest of his team serve as the main antagonists of the School Trip Arc.

Appearance
Moonfish is a fairly tall man, who's entire body is covered in a BDSM-fashioned black leather overall that somewhat resembles a straight jacket that only reveals his mouth. His body is bound by several leather belts with spikes on them and they are all over his body, with five belts notably holding his mouth wide open so that his teeth are completely visible.

Personality
Moonfish is a very disturbing individual, who gains a perverse sense of pleasure from seeing dismembered body parts. During battles he's longing for flesh, begging his enemies to provide him with more.

History
Not much is known about Moonfish's past but he is an escaped death row inmate, implying that he must have committed many gruesome crimes.

School Trip Arc
Moonfish is first seen meeting up with other members of the Vanguard Action Squad. After splitting up from the others, Moonfish encounters Mezou Shouji and Fumikage. After a brief fight, during which Moonfish cuts one of Mezou's arms off, Moonfish is left alone with Mezou's arm. Moonfish admires the disembodied body part and is so distracted by it that he does not notice Katsuki and Shouto approach from behind. Upon noticing, the 3 of them start to battle. The two young heroes are not able to attack Moonfish because the versatility of his Quirk.

During the battle, Mezou and Izuku appear at the scene, with an out of control Fumikage chasing after them. Fumikage's Dark Shadow proceeds to trample on Moonfish, shattering his teeth.

However, Moonfish gets back up using his teeth and is enraged. Moonfish attacks the rampaging Dark Shadow with his teeth, but Dark Shadow is not phased by Moonfish's counterattack. Dark Shadow grabs Moonfish and smashes him through several trees, which heavily injures Moonfish and incapacitates him. Dark Shadow throws the incapacitated Moonfish aside.

After the Vanguard Action Squad succeed in capturing Katsuki, the Police Force arrive and immediately arrest Moonfish.

Quirk and Abilities
Unnamed Quirk: Moonfish's Quirk gives him the ability to enlarge, grow and manipulate his teeth. Moonfish's teeth are quite strong as they were able to break through Shouto Todoroki's ice. Moonfish also uses his Quirk to maneuver around.