Leon McNichol is a central character in the AD Police Files OVA, a prequel set in 2027 in MegaTokyo. He begins his law enforcement career as a member of the Normal Police, driven by a strong sense of justice that led him to join the force immediately after high school. His trajectory changes dramatically after a violent encounter with a rogue Boomer, an advanced android, which prompts him to transfer to the AD Police, the specialized unit tasked with handling crimes involving Boomers. In the AD Police, Leon is a rookie officer who is often described as frustrated but dedicated. He has a tendency to act impulsively and rush into dangerous situations without fully thinking through the consequences, a trait that sometimes puts him and others at risk. Despite this, he is a skilled powered armor pilot and becomes one of the AD Police’s top aces, particularly proficient in operating the K-11 and K-12S powered suits. His role in the story is that of a frontline officer confronting the escalating violence and moral complexities surrounding Boomer incidents. He is partnered with the more experienced Gina Marceau, and together they investigate cases that force them to confront the increasingly blurred line between humans and machines. Leon’s motivations are rooted in a desire to protect ordinary citizens and uphold order, which initially leads him to distrust vigilante groups like the Knight Sabers. Over time, his experiences—including a traumatic encounter with a Boomer prostitute that nearly kills him and his involvement in cases that question what it means to be human—push him to question the very nature of humanity in a technologically saturated world. His key relationships include his partnership with Gina, which serves as a grounding influence, and his later connection with Priscilla Asagiri, a Knight Saber, with whom he develops a complicated rival-and-romantic dynamic. In terms of development, Leon evolves from a somewhat naive and hotheaded rookie into a more reflective officer who understands the ethical dilemmas of his profession. His notable abilities are his courage, his proficiency in hand-to-hand combat and firearms, and his exceptional skill in piloting military-grade powered armor, making him a formidable asset in Boomer-related confrontations.