Thank you so much for your honesty and response!
I can see why you dislike Yoko, but I personally love her, but then again, I love all of the 1.0 cast members. When you get to know her more in her path and the harem/polyamory path, you see her heart of gold and that she actually is a pretty badass fighter, but I'm not trying to make any excuses. She just has self-esteem issues and acts a bit afraid when it comes to letting people in, hence why she can be quite the Tsundere. Not everyone can be compatible with that personality, that is for sure.
And yes, Kazashi will most definitely have her own path and ends (everyone has at least 3 endings of their own) and even has two other shared paths and ends of a polyamorous nature. Glad to see you're interested in the poor sweet thing. Out of the 13 cast members, she is one of the top 5 with tragic backstories. Also, since you mentioned that you liked Bowie and Adolf's back stories, you most definitely are more likely to enjoy the twins' and probably Sakiko's. Sakiko I suppose can be seen as sweet, but above all else, she's apathetic and a bit insensitive to everything. But she is my tall, beautiful, goth baby and I adore how naive she can be. Sakiko is actually the second youngest of the full 13 cast, so she's actually pretty innocent to a certain extent.
Thank you for the hint about Suki's inner monologues, though those are way less frequent during the main part of the story/script. Each girl actually has a scene designated for telling you their backstory. Just as they all have the typical date scene, kiss scene, etc, they all have a scene for their past, hobby, a holiday, their birthday, a scene of malice (yan), a scene of vulnerability (dere), and a few others, though some of these you only get the real experience if you unlock it.
I'm glad to hear that you enjoyed the demo and are interested in playing the full 1.0. I'm currently approaching the halfway point of the main game but progress will be coming faster as I am currently looking for a job and not attending college this semester, so I have more time to write, edit, draw, voice, code, and whatnot. Also, I've had some lovely and talented ladies audition for being voice actors for the full 1.0, so that is something to look forward to! Thank you once again!