Kodoka-- Is sensible and has a spine; that's already good enough to go far. He really does treat people equally.
Yozora-- The exact opposite, or perhaps the same since she treats everyone equally... like crap.
Trolling is fun, though she took it a bit too far.
Sena-- I thought she'd be an annoying eroge obsessed self centered bitch, but she turned out to be a delightful person if you treat her with respect. Definitely surprised me the most
Rika-- At least she's happy and doesn't lack self-confidence like the others. Be proud of who you are. Really!