History
Poppa pretended to be a barman who had an interest in helping mutants escaped persecution, whilst imprisoning impressionable young mutants in a dungeon underneath the bar. He would then sell the mutants for genetic experimentation to the highest bidder.
Magneto, upon discovering Poppa’s business, enacted revenge by using the iron in Poppa’s blood to suffocate him.
Powers
Poppa’s true form appears to be a giant claw-hooved monster, but he can take the form of others, such as an innocent bartender and persumeably others. He wears these disguises as if they were clothes.