Juggernaut

Juggernaut, or Cain Marko, is literally the red-headed step-brother of Professor Charles Xavier, founder of the X-Men. Due to a magic gem he found while he and Xavier were serving in Korea he became the magical Avatar of the demon-lord Cytorrak, an unstoppable* 'juggernaut' with incredible strength and invulnerability. He wears a magic helmet that keeps out psychic powers; it's meant to be unbreakable, but literally every fight he has with the X-Men ends with the helmet breaking and one of their fifty telepaths frying his brain.

(*Character may be unstoppable in name only, and may in fact be frequently stopped by the likes of Spider-Man.)

Invisible Woman - Negative Zone

The Invisible Woman, and the rest of the Fantastic Four, had an adventure in the Negative Zone and returned to find the colours in their costumes had been inverted. Because of SCIENCE! Also, she had short hair.

This is a re-colouring of The Invisible Woman's classic costume.