These are characters that can be unlocked in the game. There are a total of 87 characters that you can unlock.

Character	How to unlock
Adult Gohan, Majin Vegeta, Majin Buu, Super Buu, Kid Buu, Janemba, Broly, Broly(Supervillian), Gotenks	Unlocked through the story mode. Complete the Buu Saga of the story mode.
Bardock, Masked Saiyan, Towa, Mira/Mira (Supervillian), Future Trunks(DB Super)	Unlocked through the story mode. Unlocked after the battle with the Masked Saiyan and then beating the final boss.
Cell (Supervillian)	Complete Parallel Quest 90
Cooler (Final Form)	Complete Parallel Quest 25
Future Trunks(DBZ Version), Future Gohan, Cell(Perfect)	Unlocked through the story mode. Complete the Future Trunks Saga of the story mode.
Gogeta	Complete Parallel Quest 57 for halo version, Complete Parallel Quest 81 for non halo version
Goku(GT), Trunks(GT)	Complete Parallel Quest 92
Goku, Kid Gohan, Piccolo, Krillin, Tien, Yamcha, Saibaman, Raditz, Nappa, Vegeta, Jaco	Unlocked through the story mode. Complete the Saiyan Saga of the story mode.
Gotens (Kid) & Trunks (Kid)	Complete Parallel Quest 48
Great Saiyaman	Complete Parallel Quest 51
Great Saiyaman 2 (Great Saiyawoman)	Complete Parallel Quest 53
Hercule	Complete Parallel Quest 56
Hit, Eis Shenron, Nuovo Shenron, Omega Shenron	You must collect all 7 dragon balls and make a wish to Shenron. You must select the option "I want more usable characters!". Needs to be done 4 times
Kid Buu (Supervillian)	Complete Parallel Quest 60
SSG Goku	Complete Parallel Quest 67
SSGSS Goku & Vegeta, Appule, Rasberry, Golden Frieza/Golden Frieza(Supervillian), Beerus, Cooler(Supervillian), Whis	Unlocked through the story mode. Complete the Battle of Gods and Resurrection F Sagas of the story mode.
SSJ4 Gogeta	Complete Parallel Quest 94
SSJ4 Goku & Vegeta, Pan	Complete Parallel Quest 93
Super 17 (Android)	Complete Parallel Quest 95
Super Saiyan 3 Bardock(Bardock Battle Suit 4)	Collect all 5 Time Distorted Eggs, and then complete the "Unknown History" Story quest
Supervillain Omega Shenron	Complete Parallel Quest 96
Supervillian Janemba	Complete Parallel Quest 57
Teen Gohan, Metal Cooler, Android 16, Android 17, Android 18, Cell(First Form)/(Full Power), Cell Jr	Unlocked through the story mode. Complete the Android/Cell Saga of the story mode.
Vegito	Complete Parallel Quest 58
Videl	Complete Parallel Quest 77
Yamcha (Supervillian)	Complete Parallel Quest 86
Zarbon, Dodoria, Nail, Guldo, Recoome, Burter, Jeice, Ginyu, Turles, Slug, Frieza(First Form)/(Final Form)/(Full Power), Cooler(Fourth Form)	Unlocked through the story mode. Complete the Namek/Frieza Saga of the story mode.