Quillsh Wammy, operating primarily under the alias Watari, serves as L's essential handler and logistical coordinator. As Watari, he acts as L's communication intermediary, notably during the Kira investigation. He founded Wammy's House, a Winchester-based orphanage cultivating intellectually gifted children; its notable alumni include L, Near, Mello, Matt, and Beyond Birthday. Initially presenting himself to law enforcement agencies like Interpol and the Japanese Task Force disguised in a face-obscuring long black trench coat and hat, he later reveals his identity as the elderly Quillsh Wammy, characterized by white hair, gray eyes, glasses, and a customary black tuxedo. He manages all operational necessities for L and the Task Force, providing funding, procuring specialized equipment like counterfeit badges and panic-button belt buckles, and maintaining secure communications. He habitually delivers food, especially sweets, to L during investigations. Watari demonstrates advanced espionage skills and marksmanship, exemplified when he precisely snipes a gun from Kyosuke Higuchi's hand during the Yotsuba Kira case from a helicopter. He strictly adheres to L's protocols, such as avoiding Task Force headquarters when Light Yagami is present to maintain the illusion of multiple Ls. His deep loyalty and emotional strength are evident, with L viewing him as a father figure. He dislikes dirty rooms and favors Earl Grey tea. His death occurs when the shinigami Rem, manipulated by Light Yagami to protect Misa Amane, kills him via heart attack. As he dies, Watari activates an L-ordered contingency: a kill-switch deleting all headquarters data to protect sensitive information, simultaneous with L's own demise. Adaptations present variations. The film series depicts him dying in an elevator during Misa Amanu's escort, prompting L to fake his own death temporarily. The Netflix film reimagines him as younger, killed by Task Force gunfire after Light writes his name in the Death Note, sending him to the ruins of L's childhood orphanage. Conversely, the 2015 TV drama shows him surviving the Kira case, personally adopting both L and Near, and continuing to assist Near after L's death despite temporary betrayals. The novel *L: Change the WorLd* explores his posthumous significance to L, including a chess game hallucination experienced by L before dying. His legacy endures through Wammy's House, subsequently managed by Roger Ruvie, who assumes the Watari role for Near. Obituaries recognize him as a globally respected philanthropist and inventor. The creator noted an underlying ambiguity in his motivations, suggesting his cultivation of child detectives could be interpreted as morally complex. In *Death Note Relight: Visions of a God*, which retells events from Ryuk's perspective, Watari's role, actions, and demise remain consistent with his core series portrayal.