"Let's go with B, because I see no other outfit on that list."
All the characters, including the hidden, unlockable ones, have their own ending, so there's plenty of reason to play through the game multiple times. That is, until you get to Lee Chaolan, at which point you put down the controller and look for a trustworthy adult to have a very, very long conversation with.
The WTF Ending
I need you to imagine something before I show you this. I want you to picture yourself as a young teen on Christmas morning. You open a small video-game-shaped gift that you've been begging your parents to get you for weeks. With an excitement you haven't felt since you still believed in Santa Claus, you push your other gifts aside and fire up Tekken 5. Your parents smile proudly, so happy to see you enjoying their present, and watch as you pick a character -- Lee Chaolan -- quite at random and begin mowing through opponent after opponent, showcasing an impressive display of grace and fluidity in the movements that you could never possess in real life.
And then you beat it. With pride, your family watches from beneath a pile of wrapping paper on the couch, your siblings gleefully glancing up while playing with their own toys. And then this happens: