Saga: Saiyan
Hero(es): Goku, Gohan, Krillin, & Piccolo
Villain(s): Nappa & Vegeta
Select Button Spectators: King Kai & Kami

Battle #2

Saga: Namek/Captain Ginyu
Hero(es): Goku, Gohan, Krillin, & Vegeta
Villain(s): Ginyu Force
Select Button Spectators: None

Battle #3

Saga: Frieza
Hero(es): Goku, SS Goku, Gohan, Krillin, Piccolo, & Vegeta
Villain(s): Frieza
Select Button Spectators: Tien, Chiaotzu, Yamcha, & King Kai

Battle #4

Saga: Androids
Hero(es): SS Goku, Gohan, SS Future Trunks, SS Vegeta, Krillin, & Piccolo
Villain(s): Androids 16, 17, 18, 18, & 20
Select Button Spectators: None

Battle #5

Saga: Cell Games
Hero(es): SS Goku, SS2 Gohan, SS Future Trunks, SS Vegeta, Krillin, & Piccolo
Villain(s): Cell Juniors & Perfect Cell
Select Button Spectators: Reporter & Hercule

Battle #6

Saga: Babidi/Majin Buu
Hero(es): SS Goku, SS2 Great Saiyaman Gohan, SS Goten, SS Little Trunks, & SS Vegeta
Villain(s): Dabura, Majin Vegeta, & Fat Buu
Select Button Spectators: Stone Krillin, Stone Piccolo, Piccolo, Babidi, & Supreme Kai

Battle #7

Saga: Majin Buu/Fusion
Hero(es): SS3 Goku, SS Goten, SS Little Trunks, Piccolo, SS Gotenks, & Mystic Gohan
Villain(s): Fat Buu & Super Buu
Select Button Spectators: Tien, Vegeta, Supreme Kai, Mystic Gohan, Kibito, Goku, Videl, & Elder Kai

Battle #8

Saga: ?
Hero(es): SS Vegeta, SS3 Goku, & SS Vegeto
Villain(s): Super Buu & Kid Buu
Select Button Spectators: Hercule, Dende, Elder Kai, & Kaiobito

Facts

In most battles, when you press select, you can see who you didn't pick to fight with, and when you press it again, you can see spectators like Tien, King Kai, or Kami.

When fighting Frieza, if you allow him to kill Krillin, then Goku will become a Super Saiyan.

When fighting the androids, if you don't use Goku, then 16 will not appear, so you will only have to fight 17 and 18.

When competing in the Cell Games, if you don't fight with Gohan or Goku, Cell will not come, and you'll have to fight the Cell Juniors forever, until you choose Gohan or Goku. Once you choose them, fight Cell, because if you kill the Cell Juniors, others will take their place.

When fighting Dabura, after you have attacked him twice, Vegeta will become Majin Vegeta and join him. After you defeat Dabura, then Vegeta will rejoin you, and you fight Fat Buu. If you want an easy win, first allow Dabura to kill Vegeta, so he can't become Majin, and then kill Dabura and Fat Buu.

After you fight and defeat Fat Buu for the second time, Goku will leave and Mystic Gohan will take his place, and Goten and Trunks will fuse into SS3 Gotenks.