"Tatsuki is one of the main characters in the Japanese manga ""100 Days to Love You"". He is a young and handsome high school student with spiky black hair and deep blue eyes. Tatsuki is known for his charming personality, confident demeanor, and athletic abilities.

Tatsuki is introduced as the captain of the school's basketball team, where he quickly displays his leadership skills and determination to win. He is popular among his peers and tends to attract attention wherever he goes. Despite his confident attitude, Tatsuki is also capable of being caring and sensitive towards others.

In the story, Tatsuki becomes involved with the female protagonist, Yuzuki, as part of a social experiment to determine if true love can develop between strangers. Despite their initial awkwardness and reluctance towards each other, Tatsuki and Yuzuki eventually develop a deep connection and grow to care for each other.

Throughout the manga, Tatsuki faces several challenges, including conflicts with his basketball team, his own insecurities, and familial pressures. However, he remains determined to overcome these obstacles and achieve his goals.

Tatsuki's character is further developed through his interactions with other characters, including his caring relationship with his sister and his competitive rivalry with another basketball captain. He also shows a playful and teasing side when interacting with Yuzuki.

Overall, Tatsuki is a well-rounded character with a charming personality, strong leadership skills, and a competitive spirit. His character development throughout the manga allows readers to connect with him and root for his success in both basketball and his love life."