Zeus WTF!?
I never herd any anime character with that name.
But if you meant the Zeus from Greek mytology than you are soooooooooooo wrong because gods from most of ancient religions arent even near omnipotence,and they cant beat even lower cosmic entities.
It doesnt mean that if he was a god that he have to be omnipotent.
As I already said gods from ancient mytologies arent even close omnipotence.Most of them are immortal(which doesnt mean that they cant be wiped from existence),but they showed flaws,and there were things that they couldnt do.In Greek mytology there is a common rule that destiny controls everything even gods.So ya see there are not all-powerful.
When ancient gods try to punish humanity they would usually send things like floods and wars to earth which some people were able to survive.If they were omnipotent they would just kill them all whit a single thought.
omnipotent means god or 1 of gods powers which is omnipresence and omniscience.......odin and zeus have this skill they r the gods of their gods and omnipotence doesnt mean u cant b killed just ask the beyonder and parallax and any1 with the infinity gauntlet that lost to the tribunal...............and in thor comics odin vs the dark gods says to 1 that none shall touch the omnipotent then she smacked him.............he says it himself that he is omnipotent and the greek gods dont get involved like that to wipe humans from existence cuz if thats the case wats stops zeus or odin from taking the power from all the gods to use it to do so......and only omnipotent beings can take the lifeforce from the gods and use it