Lord Hades of Greek Mythology. He may be the God of The Dead and King of the Underworld, but nothing points him as a bad man. He was given a rotten roll of luck and got the underworld. He had to renovate the entire place and keep it from falling into shambles. He NEVER cheated on his Persephone. He was a great king to his subjects. There is no reason to keep blatantly making him the big bad in every modern iteration of Greek myth.
And no, he never wanted to be the King of Olympus. He is the God of Riches. Everything below the earth and precious belongs to him: diamonds, gold, rubies, emeralds, you name it. He even had three kids. He has no need to be evil. He's just the owner of real estate for the deceased, trying his best to keep his property from falling apart due to overcrowding.