Proteus

Kevin MacTaggert, also known as Proteus, is the powerful mutant son of Moira MacTaggert.

Biography
After Kevin was born, his father did not want him because he was a mutant, so Moira divorced him. Kevin became too powerful and had to be contained, but he escaped and went seeking for his father, not knowing the truth. When the X-Men tried to stop him, Proteus used his reality-warping powers on Wolverine, leaving him psychologically scarred. He was finally stopped by Charles Xavier.

Background
Currently the only animated version of the character.