Hey Jaclyn! Emily here. I have two who would have some plot with Gwyn. She'd actually probably know Jahan better. He's the James-type at jahan. He's three years older and attended Aurelius and Dunhaven U, but he's best friends with Vee, so if you know her, you also usually know Jahan on some level lol. He's also a soccer fanatic! He played in hs and college, but was never really sure about going pro, since he kind of wanted a quiet, intimate life with Calla most of all. He followed in his techy-parents footsteps instead and created a popular online fantasy soccer platform. He also goes on a lot of soccer podcasts and gets invited to games and events, so he's basically just like an ~online soccer personality~. He also writes about being a dad on a blog, so he very much just kind of made his own career using a computer and his sense of humor. With being Harry's dad, he might seem like ~vaguely familiar~ when the memories kick in for her? Jahan's had two now but doesn't really know what's going on.
I also have Juno Gerges (this journal) who's Hermione! I'm not sure if she'll know Gwyn, though, because she's only just about to turn 18 and she's a student at Athena. Her parents run a dental practice in Dunhaven though (ofc) and she works part-time at the local bookstore, so she's just like a ~familiar face~ around town.