Powers: Unknown so far except for feline appearance.
Bio: The son of Greer Nelson, the super-heroine Tigra. His father was the Skrull named Criti Noll, who at the time of William's conception was posing as the hero Hank Pym. Noll died before Tigra learened she was pregnant. William is named after Greer's late husband.
Due to Noll being changed to match Pym on a molecular level, William has no traces of his biological father's Skrull DNA. He is therefore genetically the son of Tigra & the original Pym.