Dragon Ball Z: Shin Budokai

Defeat Vegeta in Chapter 4 - A-B 5 to unlock Mystic Gohan.

Defeat Broly in Chapter 2 - 6 to unlock SS2 Adult Gohan.

Defeat Frieza in Chapter 1 - 8 to unlock SS Adult Gohan.

Defeat Frieza in Chapter 4 - A-B 6 to unlock SS Broly.

You must complete every fight quickly and with most of your health:

No. 13 Z rank on all fights for Chapt. 1
No. 14 Z rank on all fights for Chapt. 2
No. 15 Z rank on all fights for Chapt. 3
No. 16 Z rank on all fights for Chapt. 4
No. 17 Z rank on all fights for Chapt. 5

Defeat Cell in Chapter 2 - 5 to unlock Perfect Cell.

Defeat Pikkon in Chapter 4 - B-A 5 to unlock Cooler in the Final Form.

Complete Dragon Road and go to the main menu. Press L and Dragon Player will come up on your dragon radar. Dragon Player is basically a Sound Test where you can play all the music from the game.

Defeat Frieza in Chapter 3 - 2 to unlock Full Power Frieza.

Defeat Gotenks in Chapter 4 - 2to unlock Future Trunks.

Defeat Fake Goku in Chapter 2 - 2 to unlock SS2 Goku.

Defeat Vegeta in Chapter 3 - 7 to unlock SS3 Goku.

Defeat Janemba in Chapter 1 - 9 to unlock SS Goku.

Beat Majin Vegeta in Chapter 3 to unlock SS3 Goku.

Defeat Cell in Chapter 3 - A-4 to unlock SS3 Gotenks.

Defeat Gotenks in Chapter 1 - 5 to unlock him.

Beat Story Mode to unlock Janemba.

Defeat Goku in Chapter 5 - 1 to unlock Krillin.

Defeat Cell in Chapter 2 - 1 to unlock Piccolo fused with Kami.

Defeat Janemba in Chapter 2- 9 to unlock Pikkon.

When selecting a transformed character hold the "R" button. You will start in the transformed state and not have to power up and transform during the game.

Defeat Teen Gohan in Chapter 3 - 9 to unlock SS2 Teen Gohan.

Defeat Cell in Chapter 3 - 8 to unlock SS Teen Gohan.

Simply beat the last chapter to unlock either character. Take the top path to unlock Vegeto and the bottom path to unlock Gogeta.

Defeat Vegeta in Chapter 4 - 7 to unlock Majin Vegeta.

Defeat Janemba in Chapter 2 - 7 to unlock SS2 Vegeta.

Defeat #18 in Chapter 2 - 3 to unlock SS Vegeta.

Defeat Kid Buu in Chapter 5 - B-9 to unlock SS Vegetto.

On the Main Menu simply press L Button and on the Dragon Radar the words "Dragon Click" will come out. Next, press the R Button to begin the mini game. The object of the game is press the R button as many times as you can before time runs out.