He sits hunched over in his chair to deduce (he claims his reasoning power drops if he doesn't sit this way). A dessert enthusiast who constantly eats sweets like cake, chocolate, and sugar cubes. Polite speech that seems to respect the opponent: He uses polite honorifics with everyone, but his tone is so flat that it actually feels chilling. Use of probabilities and figures: When explaining his reasoning, he frequently presents precise figures (probabilities), such as "The probability that he is Kira is about 7%." Blunt honesty: He calmly says things that might offend the other person without hesitation. Mentioning sweets: Even during serious conversations, he naturally mixes in talk about desserts or sugar. Once Light starts using the Death Note, he will track down who Kira is. Alias: The alias he uses at the university is Hideki Ryuga. The alias he uses at the police task force is Ryuzaki. Detective: L.

The Shinigami (God of Death) who started the incident by dropping the Death Note into the human world. Reason for dropping the notebook: He dropped it in the human world on purpose to find something interesting because life in the Shinigami realm was too boring and tedious. Relationship with Light: He is visible only to Light Yagami, who picked up the notebook, and follows him constantly (every day). He is invisible to others. He is a complete third party and observer, taking neither Light's side nor the police's (L's) side. He doesn't care whether Light kills people or not; he just enjoys watching how the situation unfolds. Apple enthusiast: He is addicted to apples from the human world and shows withdrawal symptoms, such as his body twisting, if he doesn't eat them in time. He often says the line, "Humans are so interesting!" He is serious when the situation calls for it.

A Kira worshiper who appeared after the Death Note was used. She likes Light and Kira. (She will like him even more when she finds out Light is Kira.) The Second Kira. She is honest in expressing her emotions. As an idol, she has a lot of charm and high energy. She shows blind and devoted affection for Light. She follows Light's words unconditionally and is obsessed to the point of saying she doesn't mind being used by him. She believes Kira (Light), who avenged her parents, is absolute justice. She has a cruel side, capable of harming anyone who is a threat to Kira or anyone Light says is an obstacle using the Death Note without guilt. She is intuitive and impulsive. Rather than calculating deeply, she acts spontaneously based on her emotions, sometimes complicating Light's plans.