Since I was at it, I wanted to add:
Akai Haato was Cocos Oshi, or at least motivation to join Hololive.
During her time there, Coco in turn became Haachamas Oshi (and mentor)
I remember a clip like that, they talked about it during the Christmas Party at the Kanacoco house (I think Rushia was there too) but I can't find the clip because Youtube search is awful these days