The Green Bunny

Izuku died when Katsuki was five, and the blonde has not spoken a word since. Mitsuki has always been on the rough side with her son but since the death of the freckled boy, her treatment with Katuki has been brutal. Katsuki was relieved to finally move into the dorms, he would be away from his mother, but there were still the weekends. Katsuki never felt entirely safe in the dorms, the yelling of his loud friends would occasionally send him into a panic attack. He was also uneasy about his classmates finding his Green Stuffed Bunny "Lucky Clover" which Izuku had gifted to him as a birthday present. He believed they would also come to blame him if the truth ever got out. Kyoka Jirou has become his closest friend.

other information ( small but important parts of the plot include:)
Katsuki Is violated by Dabi(raped)
Kidnapped again
Monuma teases Katsuki ( bullies)
Monuma almost rips the bunny and Katsuki speaks for the first time in 11 years