i used to main nac (lol) in mbac for a while.
Here’s my input on him in AA.
C - HE HAS NERO DEER. Like legit, 421 series. This is quite frankly amazing, although the ex version is a comedy one where he rides on the thing and you press attack buttons to make it leap around. (HEY, TAXI). Everything else is the same as old nac though. The deer recovery is pretty good. you can use the a version in the same way as you would Nero 421a. That basically gives him some better pressure options at the end of strings and the like and more ground control. I think lasers have been buffed in recovery.
F - All his old chargable normals are now actual uncharged normals and are very fast. That is pretty beasting, but he loses the deer for fnero ground bugs, which he kind of surfs on. Bad move. His lasers are defaulted to being aerial lasers which are horrible. Normals being uncharged is really good but the mediocrity of the rest of his specials lets it down a lot. You can however drop out crows with 22 series that are timed dive based which are nice and the ex version is a great laugh, he rides on the crow and can fly around and spam buttons to fire lasers.
H - Standing ground normals are the same as C, charge for them, but his crouching and aerial attacks are exactly as neco arc’s are ie shit range but pretty fast. Backdash is nerfed, crouch block doesn’t move backwards, no cigarette poke. 22 series is a command throw, ex teleports you to them before he does it. Really easy to tick into 22a, range is big, damage is kind of meh though. ground 236 series replaced for gouken style crows, 236a is horizontal and 236b is anti air whilst 236c is hnero gatling crows. j236 is aerial lasers which are bad but better than forcing him to jump to do them fromt he ground only. Teleport series changed for no real reason, A version moves forward, C moves backwards, B makes a bug pop out where he was at the time of the teleport that launches but can’t be combo’d off.
All in all, he gets a lot of what he needed, but it’s kind of split across the styles and he still doesn’t have a good airdash. If you’re really insisting on playing a comedy character neco arc is the best bet possible because NA herself has always been semidecent anyway, good pressure/mixups at close range, fuzzies, tech bait combos with good damage, dizzy setup, etc. It’s just her range buggered the fuck out of her.
But give someone else a try man, don’t be like me and waste the best part of a year trying to use dumb gimmicks to beat people better than you.