Heheh... Seems like you're in need of pets. If you don't mind...? You don't have to include them all the time - they're just there if you need someone to bump into or something. You don't have to dump them in all at once. I don't mind if they rarely appear.
Name: Evan Silvius
Group (Popular, Nerd, Outcast, Jock): Eh, your choice. Outcast or Jock, I guess.
Level 1-3: This one's really your choice. He's mostly a loner who likes to explore.
Picture:

Relation To Lura: Um, still your choice. Just a random classmate?
Backstory: Evan was born a single child. His father and mother never really had the time for him and left him to his rather dark and mysterious uncle to care for him. Evan grew up hardly knowing his parents - he's uncomfortable talking about his family and will immediately pull the subject away.
Personality: He's a quiet, quick tempered loner who prefers to be... well, alone. He likes exploring - especially exploring dark, forbidden places - and gets injured quite regularly. He heals rather quickly, though, and won't show any sign of weakness. He's uncomfortable talking about himself and can subtly change the subject.
Name: Raven White
Group (Popular, Nerd, Outcast, Jock): Jock
Level 1-3: 2, maybe? Which side is better?
Picture:

Relation To Lura: A flirty classmate who occasionally flirts with her. And with some other girls, too.
Backstory: Raven was born with a soldier as a father and a movie actor as a mother. He's slightly spoiled as his family earns a lot of money, but he isn't that snobby or stuck up.
Personality: Flirty, cunning and sly, you never know what's up with Raven until the last second. He's persuasive and charming - and yet he uses this to turn the tables to his own advantages. He doesn't really show actual emotion - laughing when the others do, smiling when it's his cue - but he never has a genuine smile on his face.
Name: Cheryl Lilyflower
Group (Popular, Nerd, Outcast, Jock): Nerd
Level 1-3: Um, whichever's higher? Or 2?
Picture:

Relation To Lura: Maybe a friendly classmate or a minor friend?
Backstory: Her parents have very high expectations for Cheryl, and Cheryl studies hard to fulfill their wishes. It's not like she doesn't enjoy it - studying is rather relaxing at times. However, she'll also sneak in moments where it's just her and a video game - she loves video games and is quite a skilled player.
Personality: Nerdy, quiet and shy, she stutters slightly when she's nervous. She's not very athletic and would settle for a video game over a book - however, she does like books and studying as well. She has a pet bluejay called Azure - if it's not allowed in school, she'll hide him in her bag. Azure knows when to keep quiet and is actually rather quiet, like his owner. Cheryl also loves animals and sketching.
Name: Luna Nightshade (Oops, just realized there was another Luna. Oh well. You can call her Nightshade if it gets confusing...)
Group (Popular, Nerd, Outcast, Jock): Outcast
Level 1-3: Whichever's highest.
Picture:

Relation To Lura: Friend or random classmate.
Backstory: Luna has a 'teacher's pet' sister named Sharon - who luckily, doesn't go to this school. Luna was always the cheeky, naughty kid back then and her parents would always scold her and say, "Why couldn't you be more like Sharon?" and Luna would say, "I wouldn't want to be." Luna didn't want to be related to Sharon and would always tell everyone her full name was Luna Nightshade - her actual last name is a bit of a mystery.
Personality: Quiet, but not shy. Quick tempered - she'd probably rip off your head (figuratively) if you even tap her or accidentally bump into her. She's brutally honest - sometimes using her honesty to over exaggerate things and insult others. She's rude and slightly creepy, occasionally pulling off creepy pranks like slime in lockers, toy spiders on desks or fake blood. However, once you get to know her, she can be a good friend. She's sarcastic all the time and occasionally pulls off poisonous plant puns when trying to cheer up her friends.
Name: Keira Breeze
Group (Popular, Nerd, Outcast, Jock): Popular
Level 1-3: 2 or the lower one of the three.
Picture:

Relation To Lura: Just a shy Popular.
Backstory: Keira was born as the youngest sister of the three. Her oldest sister is working at a cupcake bakery and the middle sister at college.
Personality: Shy and sweet, she likes to look nice - but not overly obsessive about it. She's quite friendly to everyone - until she's told to be nice to only the Populars and the Jocks. She tries to be mean around the lower ranked students - but fails. She can hardly spout an insult and is just too nice. She's gentle and loves flowers and anime. She will occasionally make references to anime in a conversation.