Anybody from dragonball z?
Goku or Superman.
All kidding aside, though? Sasuke. He's the author's chosen Mary Sue and his eyehax powers are basicaly whatever is needed to have him win, or at the very least survive, a fight. His power is the all powerful power of a shitty author pulling author fiat to ensure his precious snowflake never loses.
You can't defeat Sasuke, the most you can hope for is an undecided fight.
Do you like big boobs? Dragons? Ninja? Martial arts? Wizards? Then click here and make all your wildest dreams come true!!
Somebody already said that way to read threads
Doomsday is probably up there, though there are far more broken DC super villains.
you can't kill him. And every time you defeat him, he gets better.
For lazy answer: it's Son Go Ku. Or the merge between Son Go Ku and Vegeta (forget the name), though they (or he?) are not technically a person.
i would vote phineas and ferb or dexter to be stronger than what you guys said, exept the gods part
they could invent a time machine and kill those characters when their still a baby. if only they kill,
or i could choose aladin with his 3 wishes still remain, and still wish for the power of your favorite characters to disappear.
anime characters isn't the strongest fiction characters.