I'm going to go ahead and fill this out, just for the sake of completeness. It might make a useful short-form for anyone wanting to note my character's general nature at a glance.
4. Nyx is the last scion of a decayed noble house in a far-off land. He has come to escape his prior circumstances, and also to see and know more of the world and himself.
5. Nyx is driven by an obsession with the depths of his own potential, psychic and otherwise. He is fascinated by the world of the mind and enjoys exploring its mysteries. He would also like for his physical body to be housed in a fine manor house, preferably with several good servants and a vault full of treasure. Thus insulated from contact with the world at large, he could continue to attempt to accelerate the strange physical and mental changes that have been at work inside him ever since puberty
6. This PC is really built for non-con and mind-control/reading type scenarios. He does in fact have a pair of tentacles, although he keeps them concealed beneath his clothing in all normal circumstances. He's likely to go after N/PCs with interesting minds - any of them that are particularly innocent or otherwise intriguing will attract him.
7. I'm happy to try and help, although my skills are merely adequate. I can advise someone on how not to make an underpowered character, but for those who seek greater heights than typical, I probably can't serve them very well.