Tatsumi Kōtarō is a fictional character from the popular Japanese manga and anime series Kamen Rider. He is known for his role as the protagonist in the series, where he transforms into the superhero Kamen Rider to fight against various villains. Tatsumi is characterized by his strong sense of justice and determination to protect others. In the series, Tatsumi Kōtarō often faces challenges that test his abilities and resolve. His character development is central to the storyline, showcasing themes of bravery and sacrifice. Fans appreciate his journey and the moral lessons conveyed through his adventures as Kamen Rider.