>>3435I think Okayu may actually be Korone's daughter and they just do the shoujo ai stuff to be cute. Korone is 12-15 years older and a lot of her and Okayu's eccentricities fall into place in a scenario where Korone is an ostracized single teen mom and Okayu had no real father figure aside one or two of Korone's relatives.
Ame has talked in the past about a gypsy woman putting a curse on her family because her grandmother fucked the gypsy's husband. She said that's why she has had so many unfortunate things happen to her.
After Rushia was fired, she put out a statement saying one of the other Hololive girls would walk around the offices naked and force everyone to act like she wasn't.
Haachama is confirmed to be the daughter of a rather powerful Japanese politician who advocated to reduce Chinese influence over Japanese businesses because of how badly the chinks fucked with her and Coco. It's been theorized the reason she was sent as an exchange student to The Philippines and Australia is because the family wanted to keep her from embarrassing them.
Matsuri, despite acting as the most aggressively homosexual member of Hololive, had an incident streaming as her IRL self where you can clearly see a black man's hand opening and closing a door in the background.
I've heard rumors that Aqua's mother was a member of a delinquent girl gang who had Aqua in high school.
Other rumors include Lamy being a Yakuza heiress, Marine being the ex wife of a famous mangaka, Botan being an former member of the JSDF, Coco's father being a Q Boomer, Suisei being part Russian, Sora being Yagoo's daughter, Kronii being a tranny, IRyS making an ASMR recording pretending to be a little girl getting raped at an airport, Miko being a former JAV actress and having an actual mental disability, Reine being the daughter of a very powerful Indonesian politician or businessman, and Polka and HonHima not being that fat anymore. I haven't really looked into these though.