Here’s my biggest concern: parry, parry, super. And there’s supers that are reliable to use post-jumpin, regardless of the Gigas.
For example, Makoto’s SA 3, Yang’s Raishin Mahhaken and Oro’s EX grab super are completely invulnerable against the Gigas Breaker- and their recovery’s nothing to laugh at, either.
Also, Thongboy, you of all people should know- attacks such as Makoto’s axe kick (difficult to parry because of odd timing) and Urien’s porn-star KIIIIICK! (j.Roundhouse) are pretty safe to jump in with. I’m pretty sure you can’t punish a max-range version of the porn-star kick. As for all the other characters, it should give you an edge when they’re worried about taking ANY damage at all (low health), but… if you’ve got the Gigas, it’s kind of like hunting Ducs with a Cannon, isn’t it?
Let’s go over this character by character:
Akuma: Meh, runaway queen capability. Also difficult to parry his flip-dive because of its variable timing. There’s safer anti-air options with plenty-good payoff against him.
Ken: Viable tactic once he runs out of meter. I’d say that his EX air spinkick gives him an ace, otherwise- not only does it give him crazy hangtime, but it crosses up, juggles, safe if blocked, and in general, has good payoff vs risk. Also, he can always gain ground with EX fireballs.
Ryu: Actually… he might be SOL.
Chun: Her ground game is more punishing than yours. She don’t need to jump.
Makoto: Fairly safe jumping axe kicks, good dash-in capability to punish whiffed medium attacks, and a super that renders her temporarily invulnerable to wakeup games (as well as increasing her poke damage to match your ground game)… you might not be using your setup very often, if ever.
Oro: Nrrrgh. Doublejumps and chicken kicks give him more than enough jump-in options. I hate that fucker.
Yang: EX game. If you can pressure him into the corner before he gets sufficient meter, he’s toast. However, once he gets that EX, your ground-game bets are off.
Yun: His pokes and retaliations are a lot less damaging than Yang’s, but if you’re playing against an impatient Yun, should work. Totally fucks up his rhythm.
Urien: … EX HEADOBAAAATTTO! He’s got a plenty good ground game and tricks up his… thong. Doesn’t need to jump, even when he’s in danger.
Remy: Hugo? Crowd Remy? While this is a match about looking for the opening for the Gigas, like normal, you’re playing right into Remy’s hands- Unlike Yun, this doesn’t interrupt his rhythm at ALL.
Q: 0wnz0r3d. Moving along.
Dudley: If you’re fast enough to properly distance yourself against his jumps, I think he might be SOL.
Necro: You’d probably never, ever need use it.
Twelve: Uhh… same as Necro.
Ibuki: She’s got a LOT of mixup games available in the air, especially once she possesses EX meter for daggers. Also, her jump-in Jab-Fierce comes out hella fast. Might be able to slip in between his jabs.
Alex: Here, I think it’d be useful.
I think that covers everyone.