I don’t know a whole lot about xenomorphs and Predators but I think he’d totally have a chance against them if they’re mortal and not completely immune to his powers. If he’s faced with millions of them at a time, he’d probably retreat and try something else. I guess it would kind of depend on how clever they are.
For the most part, Aku seems to only be vulnerable to gods and powers that are divine, righteous or pure in nature. He’d have a hell of a time against characters whose powers are spiritual/divine like Aang or Korra in the Avatar state. I think one of them could totally hand him his ass.












