"Daichi is a major character in the Japanese manga ""While We Broke Up"". He is first introduced as the ex-boyfriend of the protagonist, Haruko, and plays a vital role in the story as a source of conflict and emotional turmoil.

Daichi's appearance is typical of a manga protagonist; he is tall, with spiky black hair and dark eyes. His demeanor is aloof and detached, which often comes off as cold and unfeeling. He typically wears a black leather jacket and jeans, giving him a tough and rebellious image.

Despite his outward tough exterior, Daichi is actually quite sensitive and prone to self-doubt. He struggles with feelings of loneliness and abandonment, which stem from his strained relationship with his father. This emotional vulnerability is gradually revealed over the course of the manga as Daichi becomes more involved with Haruko and her friends.

Daichi and Haruko's relationship ended abruptly due to a misunderstanding and miscommunication, which created a rift between them that has yet to fully heal. However, it is clear that Daichi still has feelings for Haruko, and he eventually pursues her again, believing that they can work through their past issues.

Throughout the manga, Daichi often comes into conflict with Haruko's new boyfriend, Kota, who he sees as a rival for her affection. Their clashes are typically emotional and intense, adding to the tension and drama of the story.

Overall, Daichi is a complex and compelling character who adds depth and emotion to the story of ""While We Broke Up"". His struggle to overcome his emotional barriers and reconnect with Haruko make him a relatable and sympathetic figure, despite his tough exterior."