"Takeshi Tanaka is one of the main characters in the Japanese manga series ""No Rejection Allowed"". He is a young man in his early twenties, with short black hair and a stoic expression. Takeshi is a high school teacher, who also happens to be a former delinquent.

Throughout the series, Takeshi's past is a topic of discussion. It is revealed that he used to be a member of a notorious gang, but left that life behind to pursue a career in education. Despite his rough exterior, Takeshi is a kind and caring person, who is dedicated to helping his students. He has a natural talent for teaching, and is well-respected by both his colleagues and students.

Takeshi's teaching style is unique, often involving unorthodox methods that challenge his students to think outside the box. One of his most notable lessons involves having his students prepare and deliver a persuasive speech on the topic of rejection. Takeshi is a firm believer that rejection is an inevitable part of life, and that it shouldn't be feared or avoided.

As the series progresses, Takeshi's personal life becomes more complicated. He begins to develop feelings for one of his colleagues, a fellow teacher named Mayumi. Despite his affection for her, Takeshi struggles with his own insecurities and his fear of rejection. He is unable to express his feelings to Mayumi, and instead chooses to keep them bottled up inside.

Takeshi's character arc is about growth and self-discovery. He learns to confront his past and confront his fears, ultimately finding the courage to pursue his dreams and express his feelings to Mayumi. Through it all, Takeshi remains a compelling and relatable character, whose struggles and triumphs are a central part of ""No Rejection Allowed""."