Good clues, the first few, should always be the kind that are applicable to a number of characters. The person who figures it out, and the rest of us after the fact, are going to have an 'aha' moment when the end comes. These clues seem to fit that mold. No sense criticizing the clues until we know the answer. No sense, also, whining that we haven't gotten it yet.
Anyway, Colette.
1. I have problems getting through doors. - occasionally walks through walls.
2. How did that pretty boy knock me out in one move? He couldn't knock out a child with such an attack. - Mithos = prettyboy, Presea = child. The rest seems self-evident.
3. I am someone who can use the power of the Universe in my attacks. - um, yeah, angelic plot power. works for me.