Shapeshifting

Alter one's form and appearance

Martians (DC Comics)
Chameleon Boy (DC Comics)
Martian Manhunter (DC Comics)
Miss Martian (DC Comics)
Mystique (Marvel Comics)
Morph (Marvel Comics)
Chameleon (Marvel Comics)
Spawn (Image Comics)
Ursula (The Little Mermaid)
T-1000 (Terminator)
Changelings (Star Trek)
Chameloids (Star Trek)