Id this poll isn't closed, I'm voting for Minerva, in part because you need more adult female characters, and in part to bump Fred and George Weasley off the top spot. I can't stand those two. More Gryffindor bullies whom everyone loves! They're not as bad as the Marauders, but that's a mighty low bar.

In your "Captured" pocket cosmos, Severus and Minerva need to be allies, as the only Hogwarts staff (and almost the only adults) in the room. The Headmaster and the Deputy Head take no guff from anyone.

P.S. Vader, of course, is the other adult in the room.