I have too many ocs so I'm gonna respond with 15 of my favorite/most protagonist-like characters, most of which are already in school:
Adam wants to be so popular so badly. He's already fairly close to one of the more popular boys, but nobody actually considers him one of the gang. He's a D average. Teachers fucking HATE him. Most kids find him annoying. He is still banned from Cooking Club because his pre-split self tried to murder the club president (he is very upset about it). Knows which closets are best for discreet fucking. Painted his locker purple.
Adrian is both an edgy loner and a jock. He has no friends besides Adam, Riku, and somewhat Garrett, keeps to himself, and spends most of his school hours studying or swimming. He aids in vandalism if the opportunity presents itself, but would rather spend as little time on site as possible. Also banned from the Cooking Club because of the pre-split murder thing (couldn't care less but still thinks McKenzie was a bitch). First one to leave the classroom. Teachers don't like him. Other kids think he's a tryhard loser.
Anchor moved here recently, so he's got that Weird And Off-Putting New Kid type deal, but he befriended the principal's son and also the demon possessing a previous villain so now he's respectfully avoided. He does ok and the teachers don't have any strong opinions on him.
Colette also moved here recently. She's too busy dealing with all the magic bullshit to worry about mundane things like grades or social status (both are average).
Divine Watcher was only allowed to attend townie school after his mother died, and only because private school was the Wrong Kind of fantasy Catholic. He & his siblings are only there until his father can arrange a situation that aligns with his religious beliefs, so Divine doesn't bother with doing well or making friends because he knows it won't matter. He's disliked because he won't shut up about being God's Chosen One (he is not).
Imogen technically goes to school because she camps out in the Video Game Club's room 24/7, but she does not attend class on account of being legally dead. People mostly don't know she exists. Her twin is on the student council. The Video Game Club thinks she's ok.
Kit no longer attends school, but when she did she was an edgy nerd with no friends and high marks. Assisted the school librarian for fun. Teachers loved her, kids called her a pompous dweeb.
Locke, like her sister Colette, also moved here recently. She became popular quickly and is well-liked by her peers. Teachers hate her mischievous and careless nature. Her grades are average.
Lucas plays football, but is not on the school team. Mike wishes he was. Other than Mike, generally ignored. Joth. C grade. Caused a lot of havoc when he was possessed but it's all cool now.
Marcel keeps his head down and tries not to draw any attention. B-C grades. Best known for his handiness and his attempts to keep Lucas possessed. People are generally irritated by his strange new obsession with shutting down the school's electricity, especially Luna and Anchor.
Patchy last went to school hundreds of years ago. She says things were simpler and better then but she was well-liked and that definitely influenced her perception. Class clown, of course. C grade.
Quincey was a tech geek, a bit of a prankster, and knew everyone's secrets. People hated her because she made them buy her silence. Generally an A student. Nobody was sad when she disappeared and was accused of murder. Best computer geek in school.
Riku is very popular. His grades are average. Spends most of his school days with his 5 closest friends. In the Cooking Club. Trying to woo one of his clubmates. Worst people can say about him is that he hangs out with Adam & Adrian Burrell as well as his 5 friends.
Vintaia last went to school over 900 years ago. She was bullied and had poor grades. After her rise to power, she destroyed her school and killed her bullies. Has no idea one of her exes is "haunting" a school building.
Zandrus was painfully average before he disappeared for a year. Now he's trying to destroy Imogen, with little success. Tech savvy but not nerdy.