Both Mila and Bella are over represented, just in different ways. Still waiting to see the other paths.
Don't get me wrong. Characters like Bella, Vanessa and Kate are great for the story in my opinion, they make it messy and risky. Bella's just got too much screen time; once we've got all of them on equal footing I'll probably learn things about Nami that make me dislike her. The focus has been pretty one sided in the story, and Bella's a polarising character. Pretending she's an angel is the same as pretending Leia isn't pimping out her employees in Wiab (and who knows, maybe still in SG with the gentleman's club).
Not going to happen. Remember that it's not a dating sim. Some characters will be more present than other, even if you don't date them, you'll have to interact with them. And don't get me wrong, I want to get to know the other girls, especially the LI who have yet to be introduced. But Bella is Bella, and she's popular for a reason.
For Nami, well, we know a bit. She's jealous, vain and manipulative. She doesn't hesitate to manipuate MC when he starts to get comfy with other girls, tell him to "slow down". Not only that, but she uses Summer's haircut when they go to the lake, and ocean confirmed in the discord this was not innocent and there's more to it.
MC also confirmed Nami was not nice in high school.
Manipulating a friend in a fragile mental state is a shit move.
Mila is cute and kind. But she also holds grudges and is a coward. If you are on Bella path, in chapter 4.5, and you chose her to walk outside, she doesn't hesitate to kiss you and get pissed when you reject her, despite the fact that she KNOWS you're with Bella.
Chapter 1 season 2 will be more centered on Zara, we'll see how she develops.
Each of the girls will have something you don't like or some sort of weakness. The theme of the game is healing, so I highly doubt that even characters like Amber or Sasha, who seem strong and grounded, won't have some weird or fucked up shit going on.
After all, Amber, a 40-year-old woman and psychologist who is falling for her client 20-year-old her cadet, is kind of fucked up.