He should be the Singularity. The perfect blend of man and not machine but technology.

Now, how they visually display that I haven't totally hammered down. My main issues would be sleekness and being attractive enough to plausibly maintain love interests.

If he's just going to be a lonely hermit that lacks the ability to "interact", then I have no desire to read that. He doesn't have to be a monster. He should still be able to sleep naturally. To eat naturally. He should have the advantage of both parts of himself.

I should want to be him.