Old King Thor

Old King Thor is a hero from Marvel comics and part of the larger Thor mythos, where he is presented as a possible future variant of Thor who exists in the far future - he is in many ways the pinnacle of Thor's character arc and has become the All-Father of Asgard, taking the place of Odin and gaining even greater powers than his father : powers which he would use in many adventures, such as helping to fight off Gorr the God Butcher, restoring life to a barren Earth during a fight with Galactus, becoming a member of the Thor Corps during Secret Wars and finally having a hand in the War of the Realms crisis.

Powers
Old King Thor had immense powers that combined those of the original Thor and his father, Odin, this ranks Old King Thor at a minimum of sky-father level but with the use of the Odin-Force (which he renamed the Thor-Force) he is a near-multiversal entity and can achieve almost any feat imaginable, though even he can struggle against particularly powerful opponents such as Galactus.

Trivia

 * Old King Thor is one of the most powerful incarnations of Thor in comics, with Rune King Thor also ranking in as one of the thunder-god's most potent alternate selves.