The purple haired runt is actually the most insufferable character so far, and there have been literal child traffickers.
He’s definitely the most openly yandere of the characters so far at least.
In his defense, the implied premise of this series is that she seems to be bending reality to make these otherwise rational storybook characters love her to the point of becoming yanderes of varying degrees, with her having to balance managing their behaviors in return for a “good ending” where none of them die.
Not all of them are guaranteed to love her in a healthy way, and obsession is already shown to run in his family. Yes, he’s not necessarily likable but also that seems to be intentional and a point of conflict that will have to be addressed eventually.
It’s a fun series but, consciously or not, it’s also a decent deconstruction of just how exhausting an otome game golden route harem ending might actually be to both achieve and maintain.
Not every character needs to be likable in order for the story to be likable.