Third definitely looks like a student. And so young, too. ._. 
But I think I'll edit Freija's description to give her something that distinguishes her as a teacher. It could be a ring or pendant or whatever with the school logo on it, or maybe some sort of identification. Like, a certain range of colours could be for fighting teachers. Like, ranges of blue-purple for fighting, each individual to identify each teacher. And maybe red-pink for the magic teachers, or something like that.
If the idea's approved, I'll probably give Freija a little ring in a pretty fuchsia colour or something.