Interesting order there. May I ask, if you have time, why?
YIPPEE I'll go character by character
Cahara: This man is canonically a whore. He's so eager to fuck the other party members. There's no way he and Celeste don't have a very active open relationship.
O'saa: He's an attractive, intelligent, well-traveled, and charismatic man who loves to hit the clubs. His silence when Daan asks if he's had one night stands speaks volumes.
Pav: Take one look at that man and his slutty outfit and tell me he doesn't fuck nasty and fuck often.
August: Similar reasons to O'saa; he's attractive, intelligent, charismatic. Sure he's settled down, but I can absolutely see him messing around in his youth.
Henryk: He's a pathetic blond man who can cook and keeps staring at Abella's ass. He is not chaste or virginal.
Daan: He seems like an experimental guy to me. Of course he is/was very dedicated to Elise, but before falling for her he likely would've had his fair share of partners.
Ragnvaldr: The man is a beefcake. He has to have people throwing themselves at him, especially before he met his wife. I don't think he would've slept around an insane amount, but sex is great for stress relief.
Marcoh: He's attractive, kind-hearted, and beefy, the total package. I could see him having slept around a little during his days with The Family. I don't think he's insanely experienced, considering he's kinda shy and socially awkward, but definitely not a virgin.
Levi: Though young, he spent a lot of time shoved into cramped barracks with a bunch of other hormonal teens/young adults. No way there wasn't something going on while the lights were off. He doesn't have a high libido, but he knows what he likes.
Abella: A beautiful strong woman like her has to have at least a few suitors. I could see her having had a couple relationships, some long-term some simply flings. She's not overly interested in casual sex or hook-ups.
Karin: Her personality is a deterrent for some but a point of attraction for others. Karin's primary focus is getting the scoop, leaving little time for maintaining romantic relationships. She doesn't want a reputation for being "easy" but a woman has needs.
Tanaka: Look at this man and tell me he gets laid a lot. He's not a virgin, but I doubt he's had more than a couple partners. Definitely doesn't do casual sex, he's waiting until he's in a committed relationship.
Olivia: Not a total virgin, but definitely not experienced. Olivia has a lot of insecurities about her disability, plus people tend to get REALLY WEIRD about the sexual autonomy of visibly disabled people. It can be difficult finding someone who won't fetishize her or treat her like a fragile glass doll incapable of having sexual desires.
Enki: Do you really think this man would be fucking? He just doesn't see much value in sex. Enki has two hands (for now), if he needs sexual release he can handle it himself.
Marina: I think Marina wants to experiment sexually, she probably flirts and teases and drops innuendo, but the actual act... she worries about how they might react to finding out she's trans. Sure they might be completely unbothered, but what if they like it too much and stop treating her like any other girl. Or worse, what if they get angry...?
Samarie: I don't think anyone's surprised by this. Even if Samarie weren't completely fixated on Marina, she hasn't had the opportunity to do any real exploration. She has a high libido, she has her fantasies and desires, but no willing partners to explore with.
D'arce: This is actually canon! She's a holy knight devoted to justice and to the Knights of the Midnight Sun. D'arce is devout, her perceived purity is valuable to her. She's the kind of person who tries to proselytize to Cave Dwellers.
Levi has severe C-PTSD (not even really a headcanon, it's just canon)
Daan, being from Rondon, has a British accent. If I had to assign a specific one... maybe Contemporary RP?
O'saa has a really nice singing voice. It's silky and smooth, but very few people have actually had the chance to hear it.
If given the chance, Abella would become very protective over Marina and Levi. They've gone through so much at such a young age, and they have no-one around to support or comfort them.
Tanaka adores puzzles, specifically word and logic puzzles. He would be obsessed with Wordle in the modern day.