Hmmm. I like the Servant idea, but I do want to go with more as sort of a student under Caster; could also give Homura the idea to go with it whenever they bump into each other. And yes, please adopt her, she has no (good) parents!

Anything else that needs to be established or some kinda set up, like Caster discovering Homura? Before being recruited by Hebijo, she was a small time thief just trying to survive. I also watched/skimmed through FSN so know most of the details about it, and some FGO which is what made me fall in love with Medea.