TV-Series
Description
Teru Mikami is a criminal prosecutor who becomes a fanatical follower of Kira, the alias used by Light Yagami. He is chosen by Light to act as the public face of Kira when Light needs to avoid direct suspicion, earning him the designation of the fourth Kira and the nickname X-Kira. Mikami first appears in the latter half of the story, and his actions are central to the final conflict between Kira and the detective Near.

Mikami was born on June 7, 1982, and is 27 years old during the events of the series. He stands 175 centimeters tall and weighs 56 kilograms. From a young age, he possessed a strong sense of justice and often stood up against bullies, which made him a target of harassment. A formative traumatic event occurred when his mother and his tormentors died together in an accident, an occurrence he interpreted as divine judgment. This experience deeply shaped his worldview, leading him to believe that evil must be eliminated without mercy. He later pursued a career as a prosecuting attorney, hoping to impose proper punishment on criminals, but became disillusioned by the legal system's failures to convict the guilty. This disillusionment paved the way for his fervent worship of Kira, whom he sees as a god delivering absolute justice.

Mikami's personality is defined by an extreme, rigid sense of order and a deep hatred of chaos. He is maniacally rigorous, punctual, and disciplined, maintaining a strict personal routine that includes daily workouts even on holidays. He lives alone and has no close personal connections outside his mission. His unwavering devotion to Kira is so intense that he refers to Light as Kami, the Japanese word for god, and is prepared to sacrifice his own life to further Kira's goals. When using the Death Note, he habitually mutters the word delete as he writes names, reflecting his methodical and uncompromising approach to execution. He is highly intelligent and talented, with strong analytical skills and legal expertise, but his moral absolutism prevents him from questioning his beliefs or adapting to unforeseen circumstances.

Mikami's motivations spring from a distorted interpretation of justice. He believes that anyone he deems evil, including unproductive individuals and reformed criminals, deserves death. This view is even more extreme than Light's, and Light at times worries about Mikami's lack of restraint. Mikami sees himself as an instrument of Kira's divine will, tasked with cleansing the world of sin.

Within the narrative, Mikami serves as Light's most devoted proxy after Light becomes a suspect again and needs someone to operate the Death Note without being given every direct order. He receives the Death Note that originally belonged to the shinigami Gelus and uses it to carry out mass executions of criminals, effectively becoming Kira's hand. His presence is crucial to Light's strategy against Near and the SPK, as Mikami's actions keep the killings consistent while Light maintains his cover. However, Mikami's fanaticism becomes a liability. In the climactic confrontation, he deviates from Light's precise instructions by acting on his own initiative, which allows Near to expose Light as the true Kira. After his capture, his mental state collapses. In the anime adaptation, he commits suicide by stabbing himself with a pen after failing to kill the remaining members of the SPK and the Japanese Task Force. In the original manga, he dies in prison after descending into insanity.

Mikami's key relationship is with Light Yagami, whom he worships unconditionally. He has no meaningful interactions with other characters; even Misa Amane, another Kira follower, does not form a bond with him. His isolation reinforces his singular obsession. There is no romantic or friendly attachment, only a hierarchical devotion to his god.

In terms of abilities, Mikami is a skilled prosecutor with a sharp legal mind and keen analytical reasoning. He is physically fit due to his rigorous exercise regimen. His primary power comes from his possession of a Death Note, which allows him to kill anyone whose name and face he knows. He does not gain the shinigami eyes, so he must learn names through ordinary means. His intelligence and diligence make him effective in carrying out his role, but his emotional rigidity ultimately prevents him from adapting to the complex traps set by Near, leading to his downfall.