Unlock Bruce Buffer:
To unlock him, win 33 consecutive matches in arcade mode.
Unlock Larry Landless and Big John McCarthy:
You need to win the silver belt with all characters in Championship mode. You will get Larry Landless with one belt to go and Big John after winning the last belt.
Unlock Mask:
To unlock Mask enter the arcade mode, wait until the best record appears, then press Right, Left, Right, Left, X + Y.
Unlock Mask and Skyscrape:
Win all the gold belts in Legend Mode with all regular unlocked characters. You will get Mask with one gold belt to go and Skyscrape after winning the last belt.
Unlock Fighters:
Win five matches in a row to unlock fighters from the list below. Each streak of five unlocks a new guy.
1. Robbie Lawler 1. Robbie Lawler
2. Tsuyoshi Kosaka
3. Vitor Belfort
4. Pat Miletich
5. John Lewis
6. Dan Severn
7. Jeremy Horn
8. Hayato Sakurai
9. Maurice Smith
10. Mark Coleman
11. Mikey Burnett
12. Bas Rutten
13. Gary Goodridge
14. Frank Shamrock
15. Marco Ruas