The ones im a bit unsure about are :
Zoey she kind of just disappeared if I recall ( can't recall if she came back into the story or not I forget either way her interactions were limited)
Catalina : if I recall correctly she is still back in the city.
Cassie : but she kind of just came into the story and Suspect she is gonna play a big role I think she might be safe to assume she is a harem member seeing how she is Claire's daughter
Blue not sure if that is her name but what I have written down but she is super mysterious and not even sure if we talked to her at all. So can't get a read on her at all
Kathrine 90% sure is a side girl
Francisa Also not completely sure as I cant recall if she came with us to the hideout or not. Feels like I need to replay this game to get a refresher or at least skip through some of it
Martinez : pretty sure she will be a harem member when she comes to the hideout she feels like she will be important
For reference, the only female characters who accompanied us to the outpost were Claire, Abigail, Cyan and a Japanese girl that was already here before us and whose name name eludes me.
We were then joined by Emily and Valentina before reaching Cassie's group in the hospital.
Zoey's role remains unclear: she mysteriously disappears and is not mentioned for a long time. I heard Ethan say, though, that she would be part of the reinforcements he plans to send from the city.
I also remember a scene where the MC wakes up wounded and has a brief chat with a blonde woman seen from behind, and he mentions Zoey's name on this occasion, which seems to suggest a future passage in the story.
It seems to me that Zoey potentially has some importance that will be revealed later. Zoey may be part of this rebel/terrorist group mentioned by Ethan.
As for Blue, I have no idea what her role will be, given that our meeting was brief and recent. In fact, her cousin would like them both to leave once the situation has calmed down, so it's hard to say how important this character really is.
Francisca didn't leave with us for the outpost, and I don't know what happened to her; she probably stayed in the city, same for Catalina.
I share your opinion about Kathrine, I doubt our relationship with her will become more serious.
Cassie is likely to be part of the harem, and I agree with you on that.
We can also reasonably include our long-time sex friend, Anaïs, along with a few others like Francisca, Claire, and Abigail, Cyan (?).
As for Valentina, it's less certain, especially with the baby she eventually wants to raise on the farm/ranch.
Emily might also be a possibility. For the others I haven't mentioned, I'm really not sure.