"Hiiragi Natsuo is a prominent character in the Japanese manga series ""King Killer Reborn."" Natsuo is a young and skilled assassin, known for his precision, agility, and cunning. His name echoes throughout the series as his actions and decisions heavily influence the plot.

Natsuo is the main character's rival and has a complex relationship with him. The two characters bond over their love for violence and power, but Natsuo is also set on proving he is the better assassin. Despite his ruthless nature and often cold demeanor, Natsuo is revealed to have a compassionate side and a troubled past. He struggles with his past and the morality of his actions, which lead him to question his loyalty to the organization he works for.

Natsuo is depicted as a handsome young man with sharp features and a lean build. His eyes are piercing, and he is often seen with a serious expression. He always dresses in a black suit, a signature of the assassin's organization he belongs to. Natsuo is highly intelligent and has excellent strategic planning skills, which often give him an advantage in battles.

Throughout the series, Natsuo is involved in various violent and deadly missions, showcasing his skills as an assassin. He is willing to go to great lengths to prove himself and is never afraid to face a challenge head-on. His character development allows readers to understand the motivations behind his actions and his internal conflict.

In summary, Hiiragi Natsuo is a complex and multifaceted character in the ""King Killer Reborn"" manga series. He is a talented assassin with a troubled past and a conflicted conscience. His name and actions heavily influence the plot and make him a worthy rival to the main character."