Defeat Leon during the first fight with him to get an early ending for the game.
12/2/2005
Mary and Dalis: Together Again
After exiting Frozen River but before going to Heidelberg, go south to Cyril and into one of the houses in the lower left corner. Mary will have a flashback. As a result, Mary will be able to join you later in the game and you won't feel guilty for ruining her life.
4/18/2006
Unlock Bruiser Kang for your party!
Bruiser is an optional character who is a bit of a brute. He's one of the strongest characters in the game. To do this you need be able to compete in the arena before the world is ruined with the sky covered up.