The fun thing is, the mythical Thor isn't really a dim-wit, nor necessarily having red hair. He's quite smart, but doesn't really think things through, and of course has quite the temper. But when he sets down to think, he can come up with good plans and execute them.
As for the red hair, he has been described as "red", but that word when applied to people can imply having rugged or bronze skin, i.e. it implies that he spends a lot of time in outdoors activities.
But affable earthiness is at the core of what the mythological Thor is about. He has a temper, but then he will happily toss down a beer with whatever person he was angry at earlier.
«Speaking generally, it is because of the desire of the tragic poets for the marvellous that so varied and inconsistent an account of Medea has been given out» (Diodorus Siculus, The Library of History [4.56.1])
So you don't think Silver Surfer or Hepzibah and Corsair would fit in GOTG?