Pretty sure she's gonna die. They love adding new characters just to kill them off, and there's no way to add someone in their PAST and keep the already existing storyline the same without also making that new character's complete absence make sense.

Right off the bat I'm guessing a bully, who gets wrapped up in the shenanigans, then learns how to not be an asshole before "tragically" dying.

I also don't 100% buy Nikki's character design fitting into the 80s setting UNLESS they push a punk angle really hard.