Dragon Ball Z: Shin Budokai - Another Road
Successfully complete Arcade mode with any character to unlock the "Bonus" option under the options menu. This option allows you to listen to game music and play the Dragon Click mini-game.
While choosing your character, hold L and press X on the Super Saiyan form. If done correctly, you will hear a cling sound.
Defeat Bardock with Goku in Chapter 5 in Story (Another Road) mode to unlock him.
Defeat Dubora in the second level of Chapter 2 in Story (Another Road) mode to unlock him.
Successfully complete Chapter 5 in Story (Another Road) mode to unlock Future Gohan.
Successfully complete the main storyline in Story (Another Road) mode by not taking any alternate paths or branches to unlock Majin Vegeta.
Defeat Picolo in the alternate path of Chapter 3 in Story (Another Road) mode to unlock him (fused with Kami).
Successfully complete the main storyline in Story (Another Road) mode by not taking any alternate paths or branches to unlock SSJ4 Goku.
Successfully complete the third level of Chapter 7 to unlock Super Buu with Gohan absorbed.
Successfully complete the second level of Chapter 7 in Story (Another Road) mode to unlock Super Buu with Gotenks absorbed.
Highlight a character that can transform and press Right. Choose your transformation state. Then, fill your Kai meter to just over half. Press Down + Circle to transform. Note: If you get hit with no Kai remaining, you can transform back into your normal state.