I think the fact that both have high psychic abilities doesn't help Giegue's case, either.
I gotta agree with you on this one. The major problem comes with the fact that Giygas/Giegue uses attacks that 'you can't grasp the true nature/form' of. Interestingly enough, if you check the way Giygas behaves in Earthbound/Mother 2, all of his attacks are actually technically
attacks already in the game. If you'd rather not use the link to look, Giygas uses PK Rockin' Beta/Alpha, PK Thunder Beta, and PK Flash. So that.. still kinda puts us in a crappy spot for Giegue/Giygas' inclusion, 'cause to be faithful to the character you'll be dipping your fingers into a pie that's already seen two hands being dipped into.
Only way I could see Giegue/Giygas working as a playable fighter would be to make his attacks incomprehensible. By that I mean, projectile attacks he has come out with random variables and are difficult to identify for the defender. As an example, if Giegue has a more traditional projectile attack, it would be hazy, maybe even colorful one moment, then next time you use it's a jumble of geometric shapes. Sometimes the projectile flies forward, sometimes the projectile boomerangs, sometimes the projectile flies up and down. Sometimes the hitbox is kinda small, other times, the hitbox is difficult to discern. Sometimes the projectile comes out really fast, other times, it comes out sluggish. Cool to imagine, probably neat to play as. That's how I imagine some of how Giegue would function as a playable character.
Essentially, you'd have the explore the fighter as one that hits hard, has attacks and specials that are inconsistent and difficult to react to because of the nature of the attacks; they could help you, they could hinder you. Incorporating traditional PK/PSI attacks would be best done in a different way from the current Mother characters.
Anyway, that's just my opinion on it. I think as a playable character, Giegue/Giygas has more hurdles to jump than simply looking like Mewtwo, having similar attacks to the cast already represented, and moveset potential that's already been mostly tapped by Mewtwo, in my opinion. While I love the idea of Giegue/Giygas playable, Porky, Masked Man, Duster and Jeff are my primary picks.
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