Koga Narushima is a fictional character from the popular manga and anime series Kengan Ashura. He is known for his exceptional martial arts skills and his role as a fighter in the Kengan matches, where various combatants compete for dominance. Koga is characterized by his determination and strong sense of justice, making him a compelling protagonist in the series. In the story, Koga trains under the guidance of Oma Tokita, another prominent fighter, to improve his abilities. His journey involves facing numerous challenges and opponents, showcasing his growth as a martial artist. Koga's character embodies themes of perseverance and the pursuit of strength.