Shuuichi Aizawa, a detective in Japan’s Kira investigation unit, balances unwavering ethical rigor with a gruff, no-nonsense approach to justice. Tasked with apprehending Kira, he clashes with unorthodox strategists like L and Near, favoring transparent methods over their cryptic maneuvers. Initially serving under Soichiro Yagami, Aizawa temporarily withdraws from the case to protect his family—including daughter Yumi—before rejoining with renewed resolve. His physical transformation—from an afro to a cropped disguise marked by rugged stubble—mirrors his evolving role in the prolonged hunt. Aizawa’s skepticism of authority fuels confrontations with L’s secretive tactics and Near’s detached leadership, refusing compliance he deems compromising. During the Yotsuba Group inquiry, he covertly defies political pressure to halt investigations, collaborating with allies to expose corporate collusion with Kira. His sharp analysis proves vital in confirming the Death Note’s supernatural nature, advancing the team’s understanding of its lethal mechanics. Mounting distrust of Light Yagami drives Aizawa to independently alert Near, setting the stage for the final showdown. He smuggles a weapon into the decisive confrontation, aiding Souichiro Yagami’s rescue and supplying Near with irrefutable evidence against Light. Beyond the task force, Aizawa navigates tensions between duty and family life, anchored by his wife Eriko and two children. His enduring bonds with colleagues—lifelong friend Hideki Ide and respected junior Hirokazu Ukita—underscore his loyalty to both personal and professional spheres. Public favor for Kira’s fear-based order fails to sway Aizawa, who condemns such peace as fraudulent. In the investigation’s climax, he challenges Near’s commands during Light’s escape attempt, prioritizing moral conviction over hierarchy. His arc weaves principled independence with personal sacrifice, cementing his legacy as a detective who navigated moral gray areas without relinquishing his core belief in justice’s human face.