And Persephone was Hades’ niece on both her Mum’s and Dad’s side. Demeter and Hera and Zeus and Hades and Poseidon were siblings too. Everyone married each other’s sibling, cousin, or whatever. What a small, wonderful world!

Well, in terms of the whole pantheon, I wouldn't call him nice, but I can't think of any significant strikes against Hephaestus.

it was kind of tough to punish the king of the universe for anything