Superstone
Darth Sideous' alter ego is Emperor Paltapine.
He was Thomas A. Anderson and Neo (both the same person, obviously)
Usagi Tsukino .
Dick Head
Spider-Man's alter ego is Peter Parker.
I think that was Joker Batman's alter ego is billionaire Bruce Wayne.
Charlie's alter ego is named Hank Evans in the movie Me Myself and Irene.
Bruce Wayne
Sasha Fierce
Sasha Fierce is not Beyonce's real name. Her real name is Beyonce Giselle Knowles. Sasha Fierce is the name of her alter-ego.
Hannah
An alter ego is an alternative identity of a person, or a close and intimate friend.
Spaceman Spiff's alter ego is Calvin.
Batman is Bruce Wayne's alter-ego.
street name, handle, alter ego
Agent P