He has many notable quirks and eccentricities, such as holding things with his index and thumb fingers, crouching instead of sitting, mostly walking around barefoot, and having an unnatural affinity for sweets, cakes, candies, dairy foods and confectionery foods. That date is marked in episode 8, about 20 minutes and 55 seconds into the episode; L dies around two days later.Take your favorite fandoms with you and never miss a beat. These actions/habits include biting fingernails, placing feet on furniture, slouching, chewing with an open mouth, talking with his mouth full, and calling out personal observations that may offend others.

Per tutti è stato difficilissimo sopportare l’isolamento richiesto dalle (...) The actor also ate sweets that L would eat, and carefully considered the details of L's signature gestures.

Ohba claims he left "everything" about L's character design to Obata, who asked Ohba if L could be "unattractive." COSA E’ L’ ISEE è l’indicatore della situazione economica equivalente.

Suddenly, L and Light receive news of Soichiro having collapsed of a heart attack due to stress, and at the hospital, L has Soichiro confirm his identity, while also asking for Light's thoughts on Kira's identity.

L (エル, Eru) is a world-renowned detective who takes on the challenge of catching the mass murderer known as Kira. Obata drew L as an "attractive young man" until Chapter 11, when the character appeared in person. In his investigation, L becomes suspicious of Light Yagami and makes it his goal to prove that Light is Kira. In Obata's opinion, if the style resembles capoeira, then this "adds another element to it" and "that makes me happy." Although L's death regressed the Kira investigation's progress, he had prepared himself with a contingency plan to ensure that someone would continue L's work in hunting down and apprehending Kira, by selecting two gifted child orphans to be his potential successors, one of whom eventually succeeds in exposing Light as Kira. Kaneko decided to offer the role to Ken'ichi Matsuyama, "very much a newcomer." Ohba mentions having given L the alias "Ryuzaki" because L is pronounced like R in Japanese. It is recommended that capital L be used as the abbreviation of liter because the lowercase l can easily be misread as the numeral 1.

When Misa finds evidence as to who the Third Kira is, L is a little underwhelmed, but comes up with a plan to stop L stands out in the rain, hearing the "bells," and A few killings after Misa's release, the killings from Kira start up again, resulting in L quarreling with the Task Force as he plans on using the notebook to test the legitimacy of the 13-day rule. He is good at deceiving his opponents, and is willing to take drastic measures to solve a case. L stayed in England for five years, and during that time he was the tennis champion in the England Junior Cup.

Light convinces Rem to not just write L's name in the notebook but to also write the manner of L's death. L is a very slim, tall young man with messy black hair and dark eyes.

After deducing that the serial-killings are all connected and perpetrated by a single mastermind and are sourced from Japan, L allies himself with the Japanese police force and assists them in investigating the murders.