Definitely the one with my nick and in my avatar. Every time I find it especially satisfying to be this old wizard type of thing. I have my own little marks of greatness to boost my ego, like a huge tower. (Which I decided not to edit, however; I think Tel Uvirith should be small, as it's very new. The town hadn't have the time to develop around it just yet, like with older towers during hundreds of years the very least.) Staff of Magnus is also one of these, although I don't actually use it, at least in combat. Just for show.
What I'm meaning to say is I am very deep into this character. The wizard who studies a lot BUT who has some wits for the practical life as well. This Nelacayne guy feels he's finally a driving force behind House Telvanni really. He feels like the brains of the House. He tolerates the Mages Guild and thus has managed to warm Telvanni's ties to it a bit, possibly thinking that in the future, Mages Guild could become some subdivision for the House. He's all for letting the expansion to the west continue, though, and dislikes most of his own council members. He's younger, more energetic and cares much more about the House politics than those ancient Council members for example. He has already silenced Neloth and Dratha for example. Then again, he's good friends with fellow researcher Baladas Demnevanni, and especially with his mentor Master Aryon who he respects a lot and finds as a rare equal: a younger powerful Telvanni figure with a will to advance and hunger for power in all Telvanni's magical superiority. Yet he is clever and careful. He thinks it's possible that Aryon is playing a game on him. He rose unlikely fast in the House rankings and became the Archmagister, and, although likes and respects Aryon, also keeps on eye on him, so that he won't be a pawn for Aryon or part of any scheme to outrule him, for example.
In all his greatness, my character is much of an egomaniac even. If there's someone who he cannot beat (like Gaenor at one point, for example), he won't show his fear towards that person. He's constantly working towards being the best fighter there is, but always acts like he already was. If he thinks he cannot survive a battle, he just keeps avoiding it and pretends that no such fight exists. He never admits anything that might show he's weak. Hides his weaknesses, only shows what he's capable of in public. He's often seen walking the waters or levitating in the Telvanni area at ridiculous speeds, and thinks he will amaze people and made them envious doing that. He just boosts his ego all the time. He thinks he's some kind of an übermensch, a superhuman that cannot be touched, and does his everything to keep this as common opinion.
Yet he IS good for real and often does things others can, like loots tombs nobody else has, finds relics and so on.
Well shortly my character thinks he's the head the most powerful body in Vvardenfell/Morrowind (Telvanni) has needed for some time. He keeps things organized, has made Telvanni more active (mostly by doing things himself) and has provoked some more fear by letting Telvanni grow, even trying to tie Mages Guild to it, and acting as an all-powerful, young, ambient, smart, lust-for-power type of figurehead to the whole Telvanni House. It's his era now, and it will make Telvanni the most prosperous of all the factions in the province, based on some old customs and laws and Telvanni's superior know-how in use of Magicka.
It's interesting that he is a High Elf though. That's something to further boost his self-confidence for conquering a Dunmer faction. He also thinks he's more elegant, higher than others, and among the purest life in whole Nirn, knowing full well the history and beliefs of his race.