[@ADamnFiddle]: In what world is the dog no good?
Accepted, though it might behoove you in the future to not just copypaste off the wiki.

[@Nanashi Ninanai]: Hm... Where to begin...
First: An image of Gwyndolin for a being related to the sun is ironic. Also, trap. And too Western. So swap that.
Next: The kit is overloaded on an entirely different level. When we started talking about Double Summon, I assumed she would have something like Semiramis' skillset... Except, y'know, minus the whole Hanging Gardens thing. In terms of Servant basis, I thought I mentioned Vlad here, since he's the embodiment of his legend after being twisted by Stoker's Dracula. I was expecting something similar, with one persona as the base and the rest influencing it, not form changing on a dime.
To that end, the NP has to be changed. That's an effective 3 classes and a new NP for each class. Would it not he possible to refine the idea a bit more and not just try to do everything at once?