The 'Too Hard' Basket

Since you've all been so helpful with that High School AU I Am NOT Writing so far, any suggestions on the below? You were all so good at giving me ideas for Leela. But I don't know what to do with:

Sara Kingdom
Kamelion
Grace Holloway
Frobisher
Laura 'Compassion' Tobin
Chris Cwej
Roz Forrester
Fitz Kreiner
Trix McMillan

The school already has one fierce hockey mistress, which would otherwise be a natural role for Sara. I'm not sure what to do with the shapeshifters, and for some reason I'm having trouble envisioning Grace in a British school setting. The rest are book companions I've not even met! (Anji Kapoor was easy even sight unseen, since every school needs a Bursar.)

Not that every Doctor Who character ever invented needs to have a starring role in this entirely hypothetical story, but I feel the need to know where everyone is, somehow.