In Death Note Mello, whose real name is Mihael Keehl, grew up in Wammy's House, an orphanage for
intellectually gifted children, and is one of two potential successors to L—the best detective in the world. When L dies, it is proposed to him to work with
Near, the other potential successor, to find L's murderer, a criminal dubbed "
Kira". Mello rejects the proposal, citing their bad relationship and different personalities. Then, he leaves the orphanage and joins the
Mafia. Aware of a Death Note—a book that allows anyone to murder individuals just by knowing their faces and names—in Japanese police's possession, Mello abducts its director; Kira, however, kills the director. Afterwards, Mello proceeds to kidnap
Sayu Yagami, the daughter of the police's vice-director,
Soichiro Yagami; Mello succeeds in obtaining the Death Note this time. Light Yagami, the true identity of Kira, discovers the location of Mello's hideout. An indirect result of this is that Mello meets the
Shinigami Sidoh, the original owner of Mello's Death Note. Sidoh reveals to him—in exchange for some of Mello's chocolate—that there are two extra fake rules (in addition to a number of real ones specified to each Death Note's owner). Mello begins to theorize that whoever Kira is, he probably used these spurious rules to fool the Japanese police into thinking he is innocent. However, Light launches a
SWAT team led by Soichiro to raid the hideout. In order to escape, Mello detonates remote-controlled explosives, after one of his Mafia accomplices fatally wounds Soichiro. Mello is left with a scar on his face, and the failure of his Mafia scheme leaves his real name in Light's hands. Mello invades
SPK—an organization that aims to catch Kira—to retrieve a photograph of himself from Near. Before he leaves SPK, Mello tells Near about Sidoh and the fake rules, which sharpens Near's suspicions on Light. Mello then enlists the help of his friend
Matt to spy on
Misa Amane, suspecting she is helping Kira. After learning that Light is Kira and Near is going to attempt to apprehend him, Mello and Matt kidnap
Kiyomi Takada, Kira's spokesperson. Matt pretends to attack Takada, and Mello offers to take her to safety. Takada agrees but then realizes his identity. Mello forces her to strip naked to get rid of any tracking devices. However, Takada uses a hidden piece of Death Note paper to kill Mello, as Light had told her his name and what to do in such a situation. Mello's actions ultimately lead to Light's downfall;
Teru Mikami uses the hidden real Death Note to try to kill Takada, which leads to Near learning that the notebook Mikami had been using prior is fake and swapping the real Death Note with his own fake for the final confrontation with Kira.
In the live-action drama In
the live-action television drama, a major change is made to this character; Mello is not a character on his own and rather is the other half of Near's
split personality, living inside of Near's body. As such, he is interpreted by the same actress that takes the role of Near,
Mio Yūki. In the first episode, this is not clear and he is first presented as a puppet in Near's hand. After knowing that L is killed, Mello possesses Near and teams up with FBI agent Shōko Himura. Mello takes Himura's help to kidnap Sayu Yagami in order to obtain the Death Note. Light Yagami makes Himura blow up Mello's hideout with the help of Death Note. Mello survives the bombing and, over the phone, vows to expose Light as Kira. Light plans another ambush with the task force and Japanese police in order to defeat Mello. Later, Light meets with Misa and Mikami and orders them to kill the task force and Mello respectively. During the ambush, Light confronts Mello in a warehouse, who reverts to his Near personality. Near reveals that he pretended to be taken over by Mello as part of a plan to expose Mikami as the current Kira.
In other media Aside from the initial manga, Mello appears in other media based on
Death Note. He serves as the narrator of
Nisio Isin's
light novel Death Note Another Note: The Los Angeles BB Murder Cases. He is featured in two video games; in
Death Note: L o Tsugu Mono, he can serve as L, and in the
Weekly Shōnen Jump-based
fighting game Jump Ultimate Stars, he is a support character. Mello also appears in the animated special ''Death Note: Relight 2: L's Successors'', which retells the second half of the anime. In it, his story is almost the same, the only exception is that Mello's involvement with the mafia is removed. ==Creation and conception==