The same thing happened with me, but possibly for a different reason. My first exposure to LB! was through the anime, specifically the English dub. Anybody who has seen both might agree with me that there is a noticeable difference between the VA portrayals of her character. From what I remember, I found the English VA somewhat normal and more emotive (she always seemed to have a half smile and hint of a laugh to her voice), with occasional “ice queen” moments here and there, whereas the Japanese VA is much more consistently even and monotone throughout. I actually remember thinking in the dub of the anime whenever she described herself that it was a little off, as I never got that impression before. She could be cold, yes, but I would never would have called her emotionless. The VN does a excellent job in both the voice and writing department of actually showing that aspect of her, and I imagine if I had read it before the anime, I would have bought into it instantly. I found it especially believable in the first few scenes after they become a couple, where she instantly transitions from “friend mode” to “girlfriend mode.”
I would say my first impression of her was she is positioned as “the girl who is supposed to have it all.” On the outside, you see someone who is intelligent, strong, beautiful, and open with big sister vibes. That impression remains until you realize the only thing she didn’t really have and possibly didn’t even realize she ever needed was something that is sometimes taken for granted: a core of friends or one close friend by your side. Describing her early on is actually somewhat tough, since she stands out which makes her seem out of place, but her air of confidence also lets her seem like she belonged all along. She retains an individual status more than anyone else within the Busters, with Kyousuke as the only likely exception.
I felt that moreso in the anime, not so much in the VN. Again, it all comes down to personal interpretation, but she still says things to the effect of “Because it’s fun?” or “I assumed that’s what the general populace would do.” Both of those types of remarks are usually followed by question marks or said quizzically, with the sprite where she has one arm folded and the other hand on her chin, as if she’s thinking it over seriously. (Or I could be overthinking it a tad bit myself.) It happened enough times that I didn’t see it as a coincidence, and that she was genuinely clueless in most situations even after joining the Busters.