>>73383181I actually do agree with you a lot. It isn't just Hololive, but a LOT of character archetypes with blonde and silver hair that have both small AND large chests that are super appealing to me.
I think you're right on the money with the B/C sizes being best for black and brown haired girls. It works great for someone like Sora and Mio for example.
I also really love Altina from Trails of Cold Steel 3/4, so I think it is a particular thing about the size of the girl and her hair color.