Pukumon is a Mutant Digimon whose name is derived from the onomatopoeia for swelling (ぷくぷく Pukupuku?), and whose design is derived from the pufferfish (Takifugu rubripes). It is a British Punk Digimon that was born when Britain's strongest hacker caused a mutation in a computer virus in which they had poured all the knowledge they possessed. Although its size is small, it has a rebellious personality that contends for first place even in the Digital World. It can't help picking fights, no matter whether the opponents are stronger or weaker than itself, and settling disputes with fist fights is considered its normal style. Its Metal Head is made from Chrondigizoit.