The Buddy Star Blaster only appears in battles with two teams. To use it, any fighter and their Buddy must combine two Buddy Star Blaster pieces, one blue and one red, and hold them together correctly. When this is done, it allows the wielders to go into the foreground and blast stars at enemies. If either fighter lands a hit on one or both opposing team members, a cutscene plays, showing the attacking team blasting a giant laser from the Buddy Star Blaster into their opponent. This laser deals close to 100 damage, incapacitating or greatly damaging foes.
Spoiler alert: Plot-specific details are within this box