Played a demo of that Mega Man X fighting game fan project. Really cool, but I get bodied by the opponent. Despite that, I found some combos with Mega Man X that gets like 45% health, though there's even easier stuff that'll let you get like 33% so it'd be more worth it to do that. Just do a Magic Series, Launch, Traid Thunder, Speed Burner, Super Charge Shot. And that gets you some damn good damage.
Zero's got neat stuff too, but he's pretty squirrely to control since half of his moves are his Command Dash.
Mega Man X's Charge Shot is kind of busted since it'll break any projectile that isn't a Super. And after any knockdown, MMX can hit you with an un-charged shot for free. I think all the characters have their crazy tech, I'm just not gonna beat the computer at the moment.