Hi I'm the friend and since I'm so nice I'll add some more context!
Character Breakdowns:
McCoy: He's the "nice" guy and a charmer. He's sweet and just the greatest guy ever, right? Well he's struggling with something. I'm not sure exactly what it's supposed to be, but he's becoming distant and when becomes destructive in behavior (the water jug) and when you try to help him he'll take it out on you. Then he'll feel horrible and he'll become more destructive until... I think you know.
Carmen: My interpretation of her is that she's a love bomber! In the beginning was the closest and the nicest to June, but when problems arise she turns into an ass and insults June. And basically is a verbal abuser when she can't have something she wants aka validation. When someone doesn't say what she wants, she turns on you.
Vonnie: She's the one I least understand but here's my idea! Vonnie is characterized as Smart, Organized, but Blunt and can be rude. And one thing that stood out to me was the Seafood (Addiction) and she has accommodations. She has to resist it but she eventually succumb to it but once she starts she can't stop, until eventually Ryan doesn't even recognize her.
Ryan: He's the "worst" one in the beginning, at least compared to the others. A cynical and lazy guy! But once everyone true colors are showing all of sudden he's the most reasonable one, besides June. But he's also not a great friend. It's clear he only thinks of himself and doesn't try to help his friends (like at the beach with everyone, when he doesn't want to interact with anyone.) or when everyone is struggling. He literally talked to mean Carmen once. He saw Vonnje struggling but didn't even try to help, and he just completely forgot about McCoy. The worst part is he knew something was up but he didn't even try and help at least with June she was oblivious, with Ryan he was aware and compliant.