Hades is sometimes called Πλούτων (Plouton), that's where his Latin name (Pluto) comes from. He's the god of the underworld, so he isn't living on the Olympus. Because of this, he became very resentful, so he isn't always trustable. The attribute of Hades is the Helmet of Darkness, this makes you invisible and you can travel through walls. When you die, you're not always going to the same place, the land of the dead has four parts;

-Tartarus, where the bad guys go to become  punished

-Fields of Asphodelus, where you go when you're just normal

-Elysium, where the heroes are going

-The Islands of the Blessed, when you're going to the Elysium, you get a choice, you can stay there, or go life for the second (or third) time, and when you're sent to the Elysium for the third time, you're going to the Islands of the Blessed.