The Timelord of Hogwarts

I basically need characters :/

Ok so these are the roles that i already have got people for:
The Doctor: My IRL friend Adam
(The companion)Amy (not amy pond): me
Hogwarts guy #1 (slytherin) DerpInTheTARDIS (Liam)
Hogwarts girl #1 (Hufflepuff) my irl friend (Libby)

OPEN ROLES
Slytherin girl: (best friends with Liam)
Hogwarts guy #2 (Gryffindor)
Hogwarts girl #2 (G)
Hogwarts boy #4 (Ravenclaw)
Hogwarts girl #5 (hufflepuff)
Potions master
Charms teacher (secretly evil)
Defence against the dark arts teacher

Tell me who u wanna be with a brief description