Probably character dependent.
So what is H-Mech? I dont think I've seen a single one. Also what specials if any does F-Mech keep from MBAC?
I don't usually use H-Mech but here's a rundown on some of her abilities:
Normal attacks - longer range(and i mean LONGER range), gains 6aaa, 5a is a finger-flick instead of slap, jb is now a extended 1 hit ja
IAD - changed to build-in jetpack instead of boosters, iad-forward flies like old j236(a), iad-backwards is old j236(b).
IAD does not release the jetpacks!
63214a - summons a mech similar to her AD(one only), has a chance to summon that guy(u know, that guy!), guy version is wallbounce
63214b - summons a flying mech similar to her AAD(one only)
63214c - summons a fighter jet(vic viper) that shoots bullets and lazers. last for awhile, high dmg but slow start up.(and probably will never hit, unless u grab after u summon it, like the old grab+ex-missile)
236a - drill punch
236b - rocket punch
236c - spike ball that causes wall-bounce
623a - extends her arms forward for a lightning attack
623b - extends her arms forward further for a lightning attack
623c - ex-version of lightning attack
214a - her bunker-counter drill from MBAC
214b - same as a version but last longer, can continue into air combo when this ends
*214c - huge ass drill that may or may not be able to continue into air combo
j236a - eye beam from the air
j236b - eye beam 2 times from the air
*j236c - ex-eye beam from the air.....
*lost all of 22x moves
F-Mech:
only specials she kept are her AD, AAD and LA
*Disclaimer: I don't use H-Mech much so it is based on what i can recall.