"Koji Ibuki is a key character in the manga ""51st Man"". He is a skilled detective working for the Tokyo Metropolitan Police Department and is known for his impressive investigative abilities and unwavering sense of justice.

Koji is depicted as a serious and focused individual who takes his work very seriously. He is seen as a model detective within the force and is respected by his fellow colleagues. Despite his professional demeanor, Koji also has a compassionate side that is shown through his interactions with victims of crime. He is especially sympathetic towards children who are caught up in the criminal world.

The character of Koji Ibuki first appears in the opening pages of the manga, where he is shown leading a team of detectives on a high-stakes operation to catch a group of armed robbers. From here, Koji plays a key role in the ongoing story, helping to solve a variety of different cases and putting away dangerous criminals.

Throughout the manga, Koji's determination and dedication are tested on several occasions. He is often faced with difficult and emotionally-charged cases, such as instances of child abuse and murder. In these moments, Koji shows his true strength of character, never once wavering from his quest for justice.

Perhaps one of the most intriguing aspects of Koji Ibuki's character is his relationship with his colleagues and superiors within the police department. Though he is highly respected by many, Koji has a reputation for being a bit of a loose cannon and for going against orders when he feels it is necessary. This rebellious streak often puts him at odds with his superiors, but it also endears him to his fellow detectives.

In the end, Koji Ibuki is a character who embodies the ideals of justice and integrity. He is a hero to many, both within the story and to readers of the manga. His unwavering determination to do what is right, even in the face of overwhelming odds, is what makes him such a compelling character and a fan favorite."