TurtleBerus

Game-Berus (ガメベロス, Gameberosu, Viz: GameBeros) was a Mysterious Being who attacked the first Hero Costume Contest. It was killed by Saitama.

Appearance
Game-Berus was a giant sentient turtle-like creature who had three heads and a shell, characterised by a muddy green-ish color. It could stand on its hind legs.

History
Game-Berus was originally a turtle. When its owner flushed it down the toilet, into the sewers, it transformed into a monster after bathing in sewage.

Personality
Not much is known about it, but it seemed determined to drown humans in sewer water.

Taste
Game-Berus interrupts a hero costume contest before Saitama can get a final verdict. After easily defeating B-Class and C-Class heroes, it declares that it will drown humans in sewer water. It is then defeated by a punch from Saitama after charging at the judges.

Power and Abilities
As a Demon-level threat, Game-Berus was quite powerful. A group of C and B-Class heroes were unable to do anything against it and the S-Class hero Genos even praised the monster after Saitama killed it, claiming Game-Berus wasn't weak.

Physical Abilities
Enhanced Durability: Game-Berus had a very tough shell and skin, as the B-Class hero Darkness Blade was not able to deal any damage to it. Enhanced Strength: Game-Berus had enough strength to effortlessly smack aside various C and B-Class heroes, including Darkness Blade whose armor was easily broken with a single hit.

Spherical Form: Game-Berus could roll into a ball to attack others with greater speed and power than his regular strikes.

Trivia

 * His name is a portmanteau of the Japanese word for turtle (kame) and Cerberus, the three headed dog that guards the underworld in Greek mythology, and the classic Daiei movie monster "Gamera".

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