Regina Mills (Once Upon A Time)
I feel like Regina would take on one of two roles; either she's the dean atau the principal.
In the first scenario, Haggar is the principal. She's the one students are sent to for misbehaving. Icy and Bellatrix see her very, very often.
If not the dean of the school, I can see Regina as the principal due to her abilities and responsibilities as the mayor of Storybrook. She's a rather stern principal but she is well liked and respected. She keeps the school organized and in control.Azula (Avatar The Last Airbender)
I feel like Azula's role is fairly obvious....