Nothing is known about the girl known as Poser, save that she was a Morlock teenager and friends with two other girls named Matchstick Girl and Carapace. The "Poser" nickname was given to her by other Morlock children.
The three girls met Wolverine and Beast of the X-Men when the pair rescued them from a Sentinels alongside their fellow Morlocks Ape and Marrow, although Carapace was injured by shrapnel from falling debris in the struggle. Beast operated on her to save her using Wolverine's claws, with Matchstick Girl providing the light.
Powers and Abilities
Upon making contact with another mutant, Poser could manifest that mutant's powers for herself to use.