@kimsim12 - I like your proposals and think that Eryn is friendly enough to play nice with all of them. Jaxon is the only one who she might be a bit wary around, but I think she'd like him. If he were to flirt with her she'd probably feel flattered.
The way I wrote her, Eryn moved down from Canada in the late school year and finished off the tail end of last year's classes. Then summer hit before she could really get to know anyone. She is just attending HA now, and was derping around town during at time. Maybe she could have run into one of them before this point?
@Yandere-Chan - Eryn would definitely like Brayden. He's adorable, and I'm certain they would get along well in most areas. He might even be able to coax her into attending a GSA meeting if they became close. I'd love to have somebody she can get close to and talk with.
As for August, Eryn is really in the closet with the whole bi-thing, so I can see this overwhelming attraction to August looks and personality being a very real possibility. Eryn would probably like here overall, but how they interact would influence their friendship and such.
Of your three, I think Luca might actually be her favorite. He'd be charming, and typical-looking for a prep (gorgeous) but there would certainly be something about him that intrigues her. For awhile she'd be on edge around him, but I think she'd warm up to him sooner rather than later. They could even have done the summer thing I mentionned to kim, I would actually prefer her having someone to talk to once she's here.