I guess I'll start out by saying: all of this pertains to my very specific version of Neloth who can be found alive and well (for now) in my fic series "Legends Never Die". It's a big wide fandom, I do not claim to be an authority on Anything, and I think everyone's little pocket universes and OC-ification of NPCs are all equally valid. These are just some of the ways I write and characterize him. So if you have any Neloth headcannons of your own, please sound off!
The Basics:
I estimate this old crusty bastard is in his 700s, or thereabouts, probably on the later end. He stopped counting at a certain point and can't be arsed to keep a talley. There are more important things that occupy his brainspace. He maintains his spry and youthful visage [cough] through his rigorous magical practices, (and his not-so-subtle interest in necromancy and discovering the secrets to immortality).
He was exiled decided to retire from the Telvanni Council a good fifty or sixty years before the eruption of Red Mountain, retreating to Solstheim to continue his experiments in seclusion. Due to severing his mainland ties and House loyalties, his power and influence are significantly weakened, though he continues to expand his studies and has a relatively well-functioning settlement of workers, as well as his current apprentice, Talvas Fathryon, under his tutelage.
And of course, the question on everyone's mind: do he fuck? In terms of his sexuality, he's finicky and if I had to slap a label on him, he's definitely in the realm of Aro-Ace, but on the gray side of things (pun intended???). Here, have an Ace Neloth Pride Flag because why not:
Personal Interests, Likes, and Dislikes:
The list of dislikes could probably rival the "color of the sky" post, so let's try to condense that into the main point: he dislikes inefficiency. The definition of what he finds "inefficient" can and does vary greatly, even in his own work. I would say one of his driving motivators is IncreasE Efficiency, above all else.
His likes are few and far between. As it stands, I could probably list three off-hand. He likes well-made tea (preferably dark, bitter, and stimulating), he likes an organized bookshelf, and he likes Teldryn Sero (who is also dark, bitter, and.... stimulating).
Morality:
Huh? What's that? Never heard of it.
I kid (kind of). Neloth has a complicated psychology. I characterize him to have underdeveloped empathy, but he is not entirely devoid of it. I suppose I'll let him explain it, (from chapter 5 of "Breathing Water"):
“I do…” Neloth began, [...] “I do… feel.” He twisted the stiff bedroll between his fingers. “I do.” [...] “It’s just…” He didn’t know where he was going with this, but the words were clawing their way out of him like some kind of sick, emaciated animal emerging from a cave. “I don’t think I… feel… correctly.” He exhaled sharply, letting his head roll from side to side, neck popping. “I’ve always been this way. It’s not just the result of graying morals from a prolonged life. I’ve always had this,” he gestured to his chest with trembling fingers, “hole. Like something’s missing.” He pulled the bedroll tighter around him, curling in on himself. A small laugh. “It’s been useful, if I’m honest.”
He does try, at a certain point, to understand this side of himself a little bit better. Though, honey, he's got a big storm coming.
Anyways, that's my Neloth post for now, maybe I'll add more another time. :) Thank you for coming to my TED Talk.