Another anime with a bullying story is 'Orange'. Naho Takamiya receives a letter from her future self, warning her about Kakeru Naruse. In the past, Kakeru was bullied by some of their classmates. The story shows how Naho tries to prevent the tragic events that were going to happen to Kakeru because of the bullying.
One example is in the anime 'A Silent Voice'. Shoya Ishida bullied Shoko Nishimiya, a deaf girl, in their school. He made her life miserable by stealing her hearing aids and generally being mean. But as they grow up, he tries to make amends.
In 'My Hero Academia', Bakugo Katsuki was often a bully to Midoriya Izuku when they were younger. Bakugo would use his stronger quirk to intimidate Midoriya and mock his dream of becoming a hero because Midoriya was initially quirkless. However, over time, their relationship has evolved and Bakugo has grown as a character.