I would probably go with neon characters like Fuchia, Claudia, Clyde, and Candi. To go with the attitude from what I remember the teen fashion was when I saw it on TV, probably Tiffany and Cherry.
I always think of the Breakfast Club when I think of the 80s too. So you can always use those guys as inspiration.
This is an unconventional choice, but I feel like Erik gives off an 80s vibe? He reminds me of the ”best friend in love with the protagonist“ character you’d see in a John Hughes movie.
Okay I gave Diana and Judy both Rad Power Skirt Suits in Purple & Pink respectively, and with Diana's heavy blush and Judy's lashes and blue eyeshadow - they look like 80's business women and I am living for it.
Their design might not be the most 80's themed or colored, but their attitude combined with the outfit is really on point.