After the first time of beating Arcade mode you get Kuma:
2nd is Julia Chang
3rd is Gun Jack
4th is Mokujin
5th is Anna Williams
6th is Bryan Fury
7th is Heihachi Mishima
8th is Ogre
Then you get Panda and Tiger.
If you beat Gon in Tekken Ball mode you earn him.
If you get all of the keys in Tekken Force Mode you will battle Dr.B. and earn him.
Of course I have more hints, tips, and cheats just look for my name OK.
More tricks, tips and cheats for this game are right here - Tekken 3 cheats
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