That's... hmm. Didn't think of that. One one hand, that's Bad, capital B. On the other, plot! As well as the fact that that's a fairly accurate description of her, or at least, her origins. What I had in mind was that due to the influence of family and our resident genderbent space jesus, what should have been a pale imitation, incapable of anything but destroying the works of her original and without worth in it's own right, nothing more than a sockpuppet of Chaos, learns to live, to laugh, to love, to be human. But for all that, as you might have gathered from the personality description, she still has to struggle with her own dark side, which propably forms the basis of an altered Queen Nehelennia arc.
That said, if you have suggestions on how to reword the vote in a way that keeps the original idea and it's plot potential while preventing unfortunate implications, I'm all ears. If not, I think I'll stick with what I have.
As well, could I possibly convince you to keep the vote open just a while longer so people can see my write-in? Nine hours isn't a whole lot for that, especially when it's at a time of day where most of Spacebattles is sleeping.
I also have to say, a powerset that deals with madness in a world where there's witches/demons has fun potential which hadn't even occured to me until now.
If I may ask, how far are you going to unify the cosmology here? Youma (or at least the possibly-fanon interpretation I'm familiar with) are fairly similar to PMMM-style Demons and Familiars, in addition to what has already been pointed out. If you want, I could link you to an old post of mine that theorizes on how one could merge PMMM with other settings such as Black Rock Shooter and the Persona series. Beyond that, if you want any of my thoughts on this topic, independent of wether my write-in wins or not, feel free to ask, as it's a topic I'm quite interested in.