Yurei should actually be weak on the health department. You could take her out with one arrow back in GF3, so you should lower it to 1 HP.
Well, I haven't gotten this yet, but I've played the last beta plenty. Chocke with invincibility frames struck me as odd. I hope he doesn't have too much health to balance that out.
Also, lulz at the blue screen of death by Creepers as Megaman/Cyborg.
Or that other thing by Yurei.