Giga Bowser is a non-playable boss character in the fighting video game, M.U.G.E.N Trilogy. He along with the other bosses are confirmed on July 4, 2017.
Giga Bowser, is the gargantuan and powered-up version of Bowser. He first appeared as a hidden final boss in Super Smash Bros. Melee's Adventure Mode and as one of the final opponents the player must face in Event Mode. He eventually made his semi-playable debut in Super Smash Bros. Brawl as Bowser's Final Smash. Having debuted in the Super Smash Bros. series, Giga Bowser is considered a part of the Super Smash Bros. universe, even though the character he is based on, Bowser, is from the Super Mario universe.