Haven High Characters and Back Story

"Welcome," Mr Tuma indicates the seat in front of his big oak desk and smiles at you affably. "Please sit," he intones in his usual melodic voice.
You sit nervously, after your experience with the council last night; you don't know what to expect. So you sit on the edge of your seat to give yourself a greater chance to escape, should things go sideways.
The Principal chuckles looking like the same old inviting principal you knew yesterday, but now you know he's not."Thanks for coming in this morning. I thought we could spend a couple of minutes getting reacquainted. " You sit silently and fidget nervously with your book bag.
He just smiles at you reassuringly and says," I see, not in the mood for a chat. Okay just know my door is always open.." You nod your head stiffly -- anything to get out of the office and on with your new life.
"I promise this will only take a moment. As Haven High's newest Enlightened student there are few things I think you should know." Firstly, this world is not for the feint of heart. We'll expect you to study hard and train even harder. Secondly, I know everyone is exceedingly attractive but looks can be deceiving, it would behoove you to remember that. Thirdly, magic will be the most invigorating and exhilarating experience you've ever had , but never underestimate it , because it's also deadly.
"Do you have any questions?" You stare at him wide eyed and tight lipped until he leans forward behind his desk to say.
"I know you'll do just fine here. Run along now." he dismisses you with a wave of his hand.
And you rush to leave the room, he calls out before you can shut the door, "Oh and don't forget, our world is not to be shared with anyone who was not previously aware of it. Understood?"
You gulp at the serious as a heart attack look on his face and say in a rush:,"I would never," but you wonder as you leave can you really keep that promise.