But if you read enough X-Men comics, you realize an uncomfortable truth. Another day of this.”Here are some of the most horrifying mutations the X-Men comics have ever inflicted on their characters. 4 Skin Skin can stretch his body to extreme lengths. He’s alive because the power sustains him, not because his body makes sense anymore. 11 ForgetMeNot ForgetMeNot’s mutation makes everyone forget him the moment they stop looking at him.