Enter Adam Sandler as a name in Make A Character mode.
Alien
Successfully complete Episode 5 with a "Perfect" rank.
Cousin Grimm
Successfully complete Episode 1 with a "Perfect" rank.
Frankenstein
Successfully complete Episode 2 with a "Perfect" rank.
Gladiator Nick Dimond
Successfully complete Episode 6 with a "Perfect" rank.
Graveyard ring
Successfully complete Episode 4 with a "Perfect" rank.
Mummy
Successfully complete Episode 3 with a "Perfect" rank.
Spaceship ring
Successfully complete Episode 5 with a "Perfect" rank.
Tomb ring
Successfully complete Episode 3 with a "Perfect" rank.
Unlocking fatalities
In Death By Elimination, there will be a series of characters. Defeat all of them and you will get your character's fatality. Complete it twice and you will get his or her second fatality.
Wizard Johnny Gomez
Successfully complete Episode 6 with a "Perfect" rank.
Wolfman
Successfully complete Episode 4 with a "Perfect" rank.