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Giga Bowser is the final boss of Adventure mode in Super Smash Bros. Melee, and Bowser's Final Smash in all further Super Smash Bros. games. As his name suggests, he is a gigantic version of Bowser, and was created as a throwback to the older "aggressive" look of Bowser from the pre-Super Mario 64 games.
Giga Bowser is officially considered to be a Super Smash Bros. character, and not a Mario character. In Super Smash Bros. Melee, his icon is not a Mushroom (as is the case with Mario characters), but a Super Smash Bros. symbol (as is the case with Super Smash Bros. characters). In Super Smash Bros. Brawl and Super Smash Bros. for Nintendo 3DS / Wii U, Bowser's Final Smash has a mushroom icon, but this is because it is a move of Bowser's, and not a separate entity like the Giga Bowser in Super Smash Bros. Melee.
Super Smash Bros. Melee
Giga Bowser first debuted in Super Smash Bros. Melee, where the player could face him after completing Adventure Mode on normal or higher difficulty within 18 minutes without using any continues. In the cutscene that follows when the player accomplishes this, Giga Bowser is created when a Bowser trophy falls onto the Final Destination stage, and is then immediately struck by lightning, right after the player defeats the giant Bowser. This revives the trophy, but the energy surge from the lightning causes the strange mutation that turns Bowser into Giga Bowser. Defeating Giga Bowser in Adventure Mode awards the player 100,000 points, along with the Giga Bowser trophy. Additionally, he is one of the opponents in the final Event Match; The Showdown, with Ganondorf and Mewtwo fighting alongside him.
Super Smash Bros. Brawl
Giga Bowser returns in Super Smash Bros. Brawl as Bowser's Final Smash. Many of Bowser's moves are hugely powered up in this form, and his roar is deeper. However, some of his attacks are actually weaker than that of the regular Bowser (such as the forward smash). He still takes damage from hits, but he does not flinch, making him possible to KO only by hitting him when off-screen, and at the top border of the screen. Giga Bowser's Super Smash Bros. Brawl trophy incorrectly states that he can't take damage at all. Because of his large size, Giga Bowser is able to easily attack and KO an opponent. The duration of this move decreases if Giga Bowser is attacked.
Super Smash Bros. for Nintendo 3DS / Wii U
Giga Bowser also appears as Bowser's Final Smash in Super Smash Bros. for Nintendo 3DS and Super Smash Bros. for Wii U, but while Bowser's moveset has been altered, Giga Bowser maintains his moveset from Super Smash Bros. Brawl. Additionally, if Bowser is using any custom moves, Giga Bowser's moveset will not be affected. In these games, Giga Bowser's snout is a tan color, instead of the light green it was previously.
Super Smash Bros. Ultimate
Giga Bowser returns in Super Smash Bros. Ultimate, as Bowser's Final Smash. However, unlike in the past installments of the series, instead of being a fully controllable character, Giga Bowser instead tries to hit opposing fighters with a powerful punch. If the punch connects properly with anyone, they are instantly Screen KO'd. Giga Bowser's colors have been slightly altered again to even more resemble those of his normal form, though his face is still turquoise. His scales are also much more smooth than in previous appearances.
Giga Bowser is also fought as a boss at the end of Mario's Classic Mode, as Bowser transforms into him after he is defeated.
In addition to being much larger than the original king of the Koopas, Giga Bowser looks far more ferocious, with a larger body, a spikier scaled shell, more muscular physique, and a new curve to his lengthened horns. As well as being an intimidating sight to behold, Giga Bowser is far more difficult to battle than his smaller counterpart.
Powers and abilities
Giga Bowser possesses the same moveset as Bowser in Super Smash Bros. Melee and Super Smash Bros. Brawl, but several moves have an elemental effect; his down smash can freeze opponents, and his forward smash is explosive. However, unlike Bowser, Giga Bowser does not have a swim animation; when Giga Bowser jumps into the water, he falls right through it and gets KO'd. Giga Bowser also cannot pick up items (except in Super Smash Bros. Melee), but he can still possess the effects of the Bunny Hood and Superspicy Curry. Lastly, thanks to his huge size, Giga Bowser is immune to grab attacks, including both Kirby's Inhale and Yoshi's Egg Lay moves.
Oddly, Giga Bowser is unaffected by Metal Boxes, as he does not gain a metallic appearance, even when players are playing a Metal Special Smash. Similarly, Super Mushrooms, Poison Mushrooms, and Lightning won't affect Giga Bowser's size, but his size can be altered by playing a Giant or Tiny Special Smash.
On a side note, while Giga Bowser is huge in size, his overall attack power is surprisingly less powerful than that of a Bowser who acquires a Super Mushroom. This is especially notable with the forward smash.
In Super Smash Bros. Ultimate, Giga Bowser grows to an even larger size than in his past appearances, and his punches can result in instant KOs when aimed just right.
Super Smash Bros. Melee
Super Smash Bros. Brawl
Super Smash Bros. for Wii U
Names in other languages