I think you misunderstood Hazel completely. Her whole point is that both the demon that terrorizes her underlings, and the caring motherly woman, are two parts of the same person. If you don't belive the way she treats Jin is genuine, look at Kanoi who is also right there, especially that one scene which i won't even try to reference in fear of spoiling.
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You're right, I probably DID misunderstand her. But that still doesn't make me like her. To me, a man who is bad at reading social cues/understanding emotions and shit, it just looks like she's bipolar. One second she's kind and caring and the next she's chewing you out for an hour because you breathed wrong or something.
It also doesn't change the fact that she seems more closed off than the others even after her 2nd H-scene. No matter what, you cannot increase your points with her through the basic repeatable hangout events. ONLY through her unique story events. Every other character's points can be increased (infinitely?) through the hangout events with the exception of Zeline before her 2nd or 3rd event. After her 2nd or 3rd Zeline can also have her points increased through repetition.
And even if she IS genuine with Kanoi, I still don't think she's the... best influence on her. No clue if Kanoi has already witnessed Hazel's rage or not, but that's probably not something Kanoi needs nor wants to see. Plus some of the stuff Hazel tells Kanoi isn't too great either. Which I guess Jin can correct, now that he's in Kanoi's "inner circle," but still.
This sits more on the personal preference side, but i don't think saying she's bipolar is quite right. Though i'm not sure how much i should discuss her given that i don't know how far you are into the game, but i can assume it's not very.
The only thing i can say about her is that i don't justify her actions, but i understand where she comes from and why she's like this.
In my personal opinion, she's among the most, if not the most interesting character in the game. But you may have to see for yourself if you want to agree.
Edit: I don't quite understand the part where you keep mentioning that you can't get Bond with her trough repeatable events. You can. I may have forgotten if the choice was unlocked later or not, but it's there. Weekend mornings.
Maybe my opinions of her will change later, but for now she's my 2nd least LIKED character. On my "interesting character" scale she's somewhere in the middle. I personally find characters like Zeline, Iris, Bella, and Oriana to be among the most interesting. And characters like Maria, Sae, Kanoi, and Oriana (again, but only after her 7/8th event) to be among the most likeable. I kinda rate them across two different scales. "Likeable" is for their personality and how entertaining they are while "interesting" would basically just be their story, arcs, character development, mystery surrounding them, and just my overall interest in the character in general.
Also I believe that would be the case then, increasing her points through repeatable events is unlocked later. I'm currently at the beginning of 0.8 with 14/23 events for Hazel, and at that point you cannot get points with her through repeatable events. Only through her unique ones.
Though I'm currently taking a break from the game as I've begun to find a decent chunk of the events repetitive or annoying in some way that I can't describe. So I'm waiting for a little bit before going back into it.