Yes, Malkavian has been hypothesized as the most similar. I don't remember who mentioned it, but it could be a "nymphomaniac" malkavian. Yet, the claws are not malkavian. Most likely, MC belongs to none of the standard 13 clans. Of maybe is just my wishful thinking.
That may have been me. It is not what I think, but more just another hypothesis. Born from the simple question of "why even give me a chance to refuse the power?" If there is not setback, the choice is almost irrelevantly dominated from a point of view of outcome, as having a power and not using it is always a possibility down the line later which is equivalent to not having the power, but not having it cannot be equivalent to having it and using. That is, unless being weak have some benefits from a story point of view. Again, a simple question born from a force of habit, not something I actually believed.