Aqua is one of the people from the other world and you can't unlock Aqua in bt3 there is only Pikkon.
well you can by doing the story mode
you can't unlock yourself if your talking about miis.
you buy him on the store
NO
he does not play in it
You cant DBZ RB 2 only goes to buu not to GT
buy it
He ain't in the game.
You don't unlock Broly because, you can get him straight away without unlocking.
Unlock and beat the mission Terrifing Majin Buu
you have to beat & unlock every character in the game.
beat his story