Cell, Android #17,and Teen Gohan:
Play through "The Androids Saga" at any level.

Freiza, Ginyu, and Recoome:
Play through "The Namek Saga" at any level.

Hercule:
Win a World Match Tournament at the "Adept" level.

Radditz, Vegeta, and Nappa:
Play through "The Saiyan Saga" at any level

Saiyaman:
Win a World Match Tournament at the "Advanced" level.

Trunks:
You can unlock trunks when you complete the "Perfect Form Cell Complete" episode.

Yamcha:
You can unlock Yamcha when you complete the "Aim For Perfect Form" episode.

Zarbon:
You can unlock Zarbon when you complete the "Vegeta's Attack" episode.

Alternate Colours:
Press SQUARE when selecting your fighter.
Submitted by - Romall Smith
Control Load Screen
To control the load screen, use the Left Analog to move the green radar. Press L3 to return it to the default.

Unlock Harder Modes in World Tournament:
After competing Story mode a second time and having take first place in the current level of difficulty in World Tournament mode, you can go to Mr. Popo's Skill Shop and unlock the next difficulty level in World Tournament mode. Beat Adept mode to unlock Hercule, Legend of Hercule mode, and Advanced level in World Tournament mode. Beat World Tournament mode to unlock Great Saiyaman.

Unlock Saiyaman:
Beat World Tournament mode to unlock Great Saiyaman.

Unlock Mystic Gohan:
Beat all the tournaments with every character, and then hold SELECT when you are choosing Teen Gohan.