From Marvel's Legends Series, it's Magneto and Professor X from the X-Men lineup!
Magneto comes with four heads (two young, two old, helmeted and without helmet), and interchangeable hands.
Magneto is the main antagonist of the X-Men, believing that mutants are evolutionarily superior to humans, and has the abilities to generate and control magnetic fields.
Professor Charles Xavier comes with swappable head (young and old), interchangeable hands, and wheelchair.
Professor X is the leader of the X-Men and is an exceptionally powerful telepath, who can read and control the minds of others.
