What I think all the THH characters' embarrassing secrets were (from the chapter 2 motive)

(Same thing in text form 👇):

Makoto (Already Known): Makoto wet the bed until fifth grade

Toko (Already Known): Inside Toko lives the dangerous serial killer known as Genocide Jack

Sayaka: Sayaka completely ruined her best friend's life in order to become a famous pop idol.

Leon: Leon was responsible for a car accident that resulted in the death of a close friend. He covered it up to spare his reputation.

Mondo (Already Known): Mondo killed his own older brother, Diya, in a motorcycle accident.

Kyotaka: Kyotaka once cheated on an exam.

Hifumi: Hifumi was a huge catfish, and scammed people online for petty cash.

Chihiro (Already Known): Chihiro is actually just a boy crossdressing as a girl.

Kyoko: Kyoko burned her hands after failing a case badly. She wears her gloves to cover up the scars.

Aoi: Aoi used to be very overweight before swimming. She has an eating disorder but doesn't want anyone to know.

Sakura: Sakura is a traitor who is secretly working with the mastermind.

Byakuya: Byakuya once crossdressed as a girl to in order to infiltrate a female led branch of a corporation.

Yasuhiro: Yasuhiro owes a large sum of money to a dangerous group of people he once tried to con.

Celeste (Already Known): Celeste's real name is Taeko Yasuhiro, and her Dream is to live in a European castle.

Mukuro Disguised as Junko: Junko spent her whole life being useful to someone who never once truly needed her.