Just a guy stuck in a crappy job. Plus they already have his sob story built in for their classic OUAT twist (“ohhh boohoo my brother tricked me into this! I should be king-god not death-god! Somebody hold me! Where’s my stolen wife!”
LOL you just made my day. But that’s my sense of Hades as well — the conflation of the god of the underworld and the Devil happened a lot later. (And I bet RG could speak more competently to this question than I would). Point is, the poor fellow’s got a bad rep. Outside of the whole pomegranate seeds thing, he’s not even all that devious.
On that note, here’s what a quick google search turned up on the Hades vs Satan topic, from this source:
“They’re both rulers of the Underworld, but that’s where similarities end. The Christian Satan is the most evil of creatures who delights in torment and pain, while Hades was long known as defender of the rights of the dead, as well as the overseer of both Tartaros and the beautiful fields of Elysium. While Satan is said to delight in walking the Earth and causing trouble, most of the interaction Hades has with humans is when they invade his domain—and sometimes, they’re given what they want.”