Cole: I get the love for him. An essential counter balance to Jimmy. Could be a major source of content in a likable package. Could also fall to the wayside. I hope he gets more assertive.
JC: I haven't see much of her, but I agree that she could be 'the infiltrator'. More on that later, but she has a potential role to fill. Along with Trish and Jimmy, seems to be one of the only Fish that might be capable of effective manipulation. I don't find her annoying (not yet anyway).
Jimmy: The hardest nut to crack. He is an essential nexus of energy for the show, but I could see him annoying the fuck out of me. He's a know-it-all politisperg. Which can be funny, but needs to be kept in check. In any case, he's certain to be a content driver so likable or not, he's a main character.
Megan: Nothing to say really. I haven't seen her do anything. I'm not writing anyone off yet, so maybe she'll come out of her shell eventually. Not annoying, not entertaining.
Shinji: Charmingly foreign character. People love him now for memey reasons, but he also has done some funny stuff. Hopefully his actual role will grow to match the fanbase's perception of him.
Summer: Another mix of annoying but interesting. As others have said, if she is able to grow and expand her presence, could easily become the main character. She already is one of the leads just by virtue of the content her anxiety has created. The voice is grating, but doesn't bother me as much as others.
Tay: What can I say, I like her. Nice and nerdy plain girl. She has the potential to stay in the background, but I hope that as conditions worsen and drama brews, she'll take on a larger role.
Trisha: One of the Fish most likely to 'play' the game by stirring shit. She can be nice and normal, but I think everyone can see the potential for shenanigans. Honestly I haven't seen much of her since it was just her and Shinji.
Brian: I missed his arrival and haven't seen anything from him except the meeting with Sam. Strong plant vibes. If he is, he seems much better at his job than fucking Damiel. Not much of a presence in my eyes.
TJ: The token sperg. The show needs one of these and he's filling the role well with his bizarre physicality. Basically the same as Josie but he's a man so he's never likely to attract much attention.