The obvious answer would be the mains characters, Matt's outgoing, Nate's shy, but I want to talk about two others that I'll explore more in the future and I love their dynamic.
Michael Cook, that guy's impenetrable. You never know what he's thinking, what he's feeling, but his actions are purely from his heart, what makes him very impulsive and umpredictable. But he hides everything, oh my god how he hides his emotions, he's explosive, yes, quite destructive sometimes, but when it's time to show vulnerability, he's a rock.
Charlotte Miller, sweet sweet girl, almost too much at the point of being naive. She's too obvious, everyone knows what she's feeling and she doesn't care, she' just sincere with her emotions. But at the same time, she's very rational in the steps she takes in her life, she likes stability and calmness.
They're a chaotic couple of friends in this group, always fighting xD and hopefully I'll get to show more of them in the near future
edit to link my comic LOL