On the subject of alpha counters we should keep in mind that typical follow-up commands, i.e. Spider Sting second hit or Vergil teleport cancel, can’t be used if recent knowledge proves correct, as well as moves that are normally cancelable like Shippuga. This doesn’t include stuff like jump/flight (I think) cancels or shit that can already be combo’d off of.
That said, I’d like to point out a couple of options that are almost unheard of or underutilized because there’s a superior option as far as assists go:
Haggar’s Violent Ax- Yeah, Lariat exists. But you can’t combo off a CC Lariat unless the opponent is high enough off the ground for you to sneak a crouching heavy in. Violent Ax, though? Yeah that’ll combo. Can even open up for happy birthday opportunities, which is something Lariat cannot do. It’s main issue has to do as an assist since it’s… yeah, not very good. Hardly not the worst, but still not good.
Joe’s Groovy Uppercut- Joe is sorta iffy as far as assists go. Bomb might be his best one if you can manage to set it up properly and Voomerang is probably the most reliable all around. But Groovy Uppercut can allow combos off a CC if you manage and Joe, despite appearances, is fairly good with capitalizing on a happy birthday opportunity. Even as an assist it’s not AWFUL, even though it’s mostly restricted to extensions.
Nemesis’ Launcher Slam- Well, it’s got armor for starters. That’s a big reason people pick this assist to begin with. Another being it’s a reliable combo extension for a lot of characters that don’t have inherent ground bounces. That said, as a CC it’s also pretty damn good since Nem can combo off it.
Chris’ Grenade/Combination Punch- Seriously, why the fuck aren’t these seen more? I mean Gun Fire is good for an assist but holy shit these two still serve purposes that still warrant attention. Specifically for CC’s, since both allow Chris to combo off a successful counter and Combo Punch is just so STUPID for that purpose.
Viper’s Thunder Knuckle- I’m not 100% certain but I think Viper can cancel her knuckle as a CC. Don’t quote me on this because I use her about as often as people use Iron Fist nowadays.
I would list Iron Fist’s assists in this list as well but his issue hardly begins with underused CC assists.