Zak likes people who are physically confident (but aren’t terribly obnoxious about it), which plays into his other preferences regarding intimate/sexual interactions. he’s a submissive sucker lol
Mei likes confidence too, but in a less physical sense. Generally focusing more on personality for people, she deeply admires extroverted individuals, especially those who inspire her own work.
Max loves a well-toned body. Can’t blame her.
Ko’s a hard one to place, but she does seem to hold less distaste for individuals who know immediately when to back away. Being wealthy can also catch her eye - but you’ll more than likely be considered a financial “target” rather than a “date” interest lol.
Ying runs on a more aesthetic attraction to people, and will admire a nice-looking person when they see one. Probably due to the nature of their job, Ying does seem to have more of a preference for people with nice skin.