David Haller (Legion)Edit
Legion is an omega level mutant with the ability to create spontaneous mutations with varying attributes. Due to either his immense powers, mental instability or combination of the two, David creates a new persona, or sub-personality, to govern each one of these new mutations.
He stated that he had, in his mind, "200 Omega-level split personalities."
Rogue stated that while she was inside Legion, she was connected to thousands of types of powers and there are more "being born" all the time.