Naomi Misora

Naomi Misora (南空 ナオミ Misora Naomi) is a former FBI agent and Raye Penber's fiancée. She left the FBI in October 2003, planning to marry Raye, move to the United States, and raise a family. After Raye's death, she decides to search for his killer. She attempts to contact the Kira investigation team, but Light manages to manipulate her, allowing Light to learn her name and kill her. She is voiced by Naoko Matsui in the Japanese anime and Tabitha St. Germain in the English dub. She takes a slightly larger role in the films, where she is played by Asaka Seto.

Ohba said that he originally created Naomi as a character that interacts with Raye. Once Raye died, Ohba believed that having Naomi hunt Kira was a "natural and interesting development. In addition, Sayu was the only other female character at the time and Ohba wanted a "cool" female character. Ohba wanted for Naomi to appear in the story longer because he felt that she was "cool". Ohba said that Naomi uncovered crucial information "faster than I thought" and decided that she had to die at that point or else "I would be in trouble." He described the Naomi storyline issue as the greatest difficulty that he created for himself since the beginning of the series.

According to Obata, after hearing about the plot he looked forward to drawing "this kind of character" (referring to Naomi) and became "invested in her" since she is "a type I've never drawn before." Obata used black as her design color to show mourning for Raye's death. Obata gave her a black leather jacket and designed her face and hair to "fit the clothes." Therefore Obata said that Naomi is "born from her clothes."