I'm right there with you.
lol, I'd read the wiki on it all, but I'd rather someone give me the "Dummies Guied to Morrowind" version
He's one of the most badass people in all of Tamriel's history. 4000+ year old reclusive Telvanni counselor, collector of Daedric artifacts (Scourge, Daedric Cresent Blade, Cuirass of the Savior's Hide), owner of Morrowind's only complete set of Daedric armor (outside of helm/shield), cared for and befriended the only living
Dwemer in existence (at least he was around during Morrowind), ran a corprusarium, literally
grew a bunch of "daughters" to live with him, and allowed thieves to freely try to plunder his possessions for entertainment. If they succeeded, they could walk away freely, as the Nerevarine does.
Oh yeah, it's also possible he's explored several planes of Oblivion on his own accord. If he is in
Dragonborn, I bet he's the one who figures out how to travel to Hermaeus Mora's realm.