When you complete the indicated mission the corresponding character will become available.
Unlock Android 17:
Complete ‘Android 17 vs. The New Piccolo’
Unlock Android 18:
Complete ‘Cute and Powerful?! Android 18 Has No Weakness’
Unlock Broly:
Complete ‘Freedom!’
Unlock Gogeta:
Complete ‘Fusion And Potara Part 1: Super Gogeta’
Unlock Goten:
Complete ‘Gohan Amazed! Goten’s Explosive Power’
Unlock Kid Buu:
Complete ‘Buu Advances! Final Battle on the Supreme Kai’s World’
Unlock LSSJ Broly:
Complete ‘Freedom!’
Unlock Majin Vegeta:
Complete ‘Vegeta and Goku’s Fateful Confrontation!’
Unlock Super Broly:
Complete ‘Freedom!’
Unlock Super Sayian 3 Vegeta:
Complete ‘The Strongest Super Sayian 3′
Unlock Super Sayian Goten:
Complete ‘Gohan Amazed! Goten’s Explosive Power’
Unlock Super Sayian Trunks:
Complete ‘Vegeta Shocked! Kid Trunks’ Explosive Power’
Unlock Super Vegito:
Complete ‘Fusion And Potara Part 2: Super Vegito’
Unlock Trunks (Sword):
Complete ‘Hey! Been a While…, Goku’s Return, and The Mysterious Boy’
Unlock Trunks:
Complete ‘Vegeta Shocked! Kid Trunks’ Explosive Power’
Unlock Vegito:
Complete ‘Fusion And Potara Part 2: Super Vegito’
Unlock Videl:
Complete ‘The Student’
