Whenever you do a summon, Goku is the summoner. Yes, thats the way most of your games go, with Luffy taking One Piece and Naruto/Sasuke rounding out Ninja Blazing. Maybe change the character? You dont have to get rid of Goku, but maybe have it random every time, like one time, Goku summons with Kamehameha. Next, Vegeta does one with his patented Final Flash. Maybe even SS Goku throwing a Spirit Bomb. Just things like that. There was another review kind of like this, so I ask Bandai Namco; is this asking too much.
~Jokarot
The shadow beneath the wind about DRAGON BALL Z DOKKAN BATTLE, v3.1.1