Jac Parker is a high school junior, so they may not know each other very well, but she's also kind of hard to miss because she's loud, outgoing and impulsive. It gets her in trouble sometimes. Her power is freezing, but she doesn't really know about it yet.
Then Tristan Faulkner is a sophomore in college, studying psychology. He's generally a very charming, popular kid. Unfortunately this is partly because he's manipulative, selfish, and good at understanding how people work. And his power is persuasion, so now it's like a million times easier for him to get people to do shit for him!