Here's a breakdown by popularity (as per many Reddit posts):
1) Luna: Typical emo with a dark past, people will like her because they remind them of a highschool crush and because of her pale skin
2) Penelope: Tig bitty older sister vibe, more mature than other "teens" in the story, will appeal to all of those that prefer maturity but not as far as MILF goes (Nancy)
3) Annie: Bestfriend crush becomes love interest is a tale as old as time, plus she's cute and shy, those who prefer her are usually shy themselves, have had crushes on their bestfriend in the past (or currently) and won't ask them out
4) Alex: The hot goth, approachable yet remains distant, the one that will always get away. This will appeal to a mature but playful audience, plus people that like being the prince charming and help her get away from her mean daddy (yep, she most definitely have daddy issues that will come up later on)
5) Nova: Cheerful weird friend that draws attention without knowing it. She's a bombshell. but she's nerdy so nobody has tried to get close. She's out of nerds' league and too weird for jocks. She's also a bit oblivious about real life (virgin, never had a cellphone, acts weird around people), she'll appeal to likewise people or the exact opposite.
6) Nancy: Mommy. MILF. Queen. A highly mature yet sex deprived woman. Only a well endowed high-energy barely 20 male can satisfy her hunger. She's into roleplay, ageplay, probable incest, and domsub. Will appeal for fans of these kinks and any guy that wants to score a milf.
7) Dalia (personnal favorite): Childhood friend almost a sister. She's the ultimate example of a physical glowup but that has not changed personality. She's the sexiest in the room everywhere she goes, but she's insecure. Nobody has tried to get her attention cause she's too self-focused. but once she opens up, you're her confident. Will appeal to guy who are into fitness girl, but that don't want the drama that comes with the popular fit girl.
Oh, 8) Micaela: Absolute beast of a woman. She doesn't lift weight, the whole room drops. She's probably in the top 50 of densest material on Earth, and top 100 of thing that create gravity in the Solar system. Will appeal to Chang