>>55407589She is cute, nice and funny, and has a good design that fits her to a tee
It is that simple
There is also a weird effect she's had on many people, myself included, where she just makes you completely obsessed with her. A disproportionate amount of people, even liggers that don't watch her, even friends who don't usually have dreams about other vtubers, dream about her frequently. It's like she seeps into the crevices of your mind and brainwashes you. There is something supernatural about her, I swear. 