ZuruniikNo love for Molag Bal? C'mon guys, he friggin created the vampires. Who doesn't love vampires? Other than that horrible abomination that appears in the "twilight" series. ESO is even based around him.
He's also the King of Rape, and the Lord of Domination. Serena undersold it when she desrcibed the ritual to turn her family into vampires as degrading.
Sheogorath puts on the facade of being loony uncle, but he's really more like the Joker - one clown wants to put a smile on the whole world's face, the other wants spread his gift to everyone - if they want it or not. He's the person most at fault for the Red Year, in front of Vivec and the Nerevine. Jyggy, on the other hand, is basically an Auditor of Reality. Not a fun guy.
Dagon's pretty boss. God of anarchy, revolution, and ambition - and his last major jaunt onto Mundus ended with a collapsed empire. Which led to a rise in Altmer extremism, Argonian's have a little payback war against a dying Morrowind, and every other problem 4E Tamriel has.
The best one is obviously Malacth though - dude used to be an Aedra. He may not actually care about his followers, but he does more for them than any other Daedra. Did I mention he used to be an Aedra? Its not as cool as Meridia being a Magne-Ge, but he's way more fleshed out.