Eikichi Onizuka is a fictional character and the protagonist of the manga and anime series Great Teacher Onizuka (GTO), created by Tōru Fujisawa. He is a former gang member and a 22-year-old high school teacher who aims to inspire and guide his students. Onizuka is known for his unconventional teaching methods and his ability to connect with troubled youth. Despite his rough exterior, Onizuka has a strong sense of justice and a genuine desire to help his students overcome their personal challenges. His character embodies themes of redemption, friendship, and the importance of understanding in education.