/jp/ - Otaku Culture

Hey my dudes I'm pretty new to this vtuber thing and I'm watching solely hololive. I've lurked some threads before and seen that there were some people implying that there is cliques and dislikes amongst the cast. Is that true? And if so, who are the know enemies?
Also I really like Haachama but I've heard something about her having mental problems, is that also true?
Sorry for the noob questions but it seems really strange for them to have bad feelings towards eachother seeing how they act on stream.