Unlock Characters
Heres what you need to do to unlock other characters:

Android #16: Defeat Android #16 and Android #18 with Goku in first position. Android #17: Use Android #20 to defeat Android #17. Android #18: Defeat #16 and #18 with Krillin in first position. Android #19: Defeat #19 as SSJ Vegeta. Android #20: Defeat Android #20 as Android #19. Burter and Jeice: Defeat Burter and Jeice with Goku. Cell: Defeat Cells first form as with Piccolo. Cell 2: Play as Cell and defeat Android #17. Cell Jr.: Defeat Cell Jr. with Perfect Cell. Captain Ginyu: Defeat Ginyu-Goku and Jeice with Vegeta. Evil Buu (Gohan Absorbed): First unlock Evil Buu (Gotenks Absorbed), then use SSJ Gohan to defeat Evil Buu (Gohan Absorbed). Evil Buu (Gotenks Absorbed): First unlock Evil Buu, then use Gotenks to defeat Evil Buu (Gotenks Absorbed). Evil King Piccolo: Complete the Future stages with SSJ Future Trunks. Fat Buu: Defeat Fat Buu with Young Trunks. Frieza: Defeat Frieza with Super Saiyan Future Trunks. Future Android #17 and #18: Use Android #19 and #20 to win the battle in EX Story 1. Ginyu-Goku: Defeat Goku as Captain Ginyu. Goten: Win the Goten vs. Trunks fight. Guldo: Defeat Guldo with Krillin. Hercule: You have to unlock all characters first. Once this is done, beat Turnks in Story 22 with the Ginyu Force (Guldo, Recoome, Burter, Jeice and both Ginyu forms). Nappa: Defeat Nappa with Piccolo. Perfect Cell: Defeat Android #16 and #18 with Cell 2 in the first position of your team. Pure Evil Buu: Unlock Evil Buu (Gohan Absorbed), then defeat Pure Evil Buu with SSJ Vegeta or Fat Buu. Recoome: Defeat Recoome with Goku. Trunks: Lose the battle of Goten versus Trunks.