I am working on a character idea for a White Court Virgin born away from court then raised by a wizard and used to infiltrate the WCV.
However to be realistic I don't think the WC would give membership to anyone "Tainted" by non human blood. they do not strike me as a tolerant organization especially under the current Merlin.
I don't actually disagree here, which is why I mentioned politics. It should be a MAJOR accomplishment to get onto the White Council as a Changeling (just for example), and I'd never let a character start out that way.
But the original character proposed had it as a major character
goal...and PCs exist to accomplish difficult and impressive things. If they worked hard, made it to the point where they had the full Wizard package on top of their Changeling stuff, and accumulate a few favors owed from the white Council to them, then demonstrate their knowledge and power during testing...I'd let them do it. Not quickly, easily, or cheaply, but I'd let them do it.
A semi-vampire? Not so much. PCs accomplish the difficult and the impressive, but some things just strain credibility too much.