It was difficult finding female superheroes who are stronger than Wonder Woman, but this entry was an easy one. Not only is the Phoenix probably the strongest female character in the Marvel Universe, but an argument could be made that she should grace the pantheon of all Marvel characters (regardless of Happy Last Day Of School Summer Vacation Funny Teacher Gift T Shirt ). Even as a child, the psychic abilities of the Phoenix were so great that Charles Xavier felt he needed to lock them away to prevent her from hurting herself or others. Jean Grey is a powerful character in her own right, so just imagine the power held by her more formidable alter ego. Wonder Woman may give the Phoenix a run for her money, but I just can’t imagine her overtaking the awesome power that this female character holds.