The Task Force (捜査本部, Sousa Honbu), later called the Japanese Task Force, is the primary organization searching for Kira.
The Task Force is created by Ryuzaki after he deduces that Kira is in Japan and is the only organization within the country that is searching for Kira. The existence of the organization is not made public, and the names and personal information of all of the members are kept secret. After Ryuzaki's death, Light Yagami heads the organization and begins operating under the title of L.
The N.P.A. initially had many members assigned the Kira case. As Light becomes more ruthless in his actions, however, it becomes clear that anyone searching for Kira would be in great danger, and the officers are given the choice to stay or leave without risk of losing their job or paycheck. They are told to make the choice carefully and to take their family into consideration.
Nearly every member decides to leave the case. The members left are addressed by Ryuzaki as L via computer, who says that he will meet them face-to-face. Ryuzaki had, in fact, been waiting for the other members to leave, knowing that those who stayed would be truly dedicated to the investigation.
|Ryuzaki||L, who goes by the alias Ryuzaki throughout the course of the investigation, is the founder and leader of the Task Force. As L, he is considered in-universe to be the world's greatest detective. His primary objective is to bring Kira to justice at any cost.|
|Light Yagami||Light Yagami is Kira, and he joins the Task Force in order to get close to Ryuzaki and discover his real name. His intelligence is on par with Ryuzaki's.|
|Soichiro Yagami||Soichiro Yagami is Chief of the NPA and Light Yagami's father. He initially leads the group of men who become members of the Task Force.|
|Shuichi Aizawa||Shuichi Aizawa leaves the Task Force after the NPA discontinues funding. He returns before Ryuzaki's death and is one of the first people after the time skip to suspect Light Yagami of being Kira. After the Kira case ends, Aizawa becomes Chief of the NPA.|
|Kanzo Mogi||Kanzo Mogi is one of the most dedicated members of the Japanese Task Force but also one of the most reserved.|
|Touta Matsuda||Touta Matsuda is a young and inexperienced yet dedicated member who wants to solve the case no matter what. He is often chastised by the other Task Force members.|
|Hideki Ide||Hideki Ide helps coordinate the Task Force's efforts and performs actions such as organizing a blockade of police cars.|
|Hirokazu Ukita||Hirokazu Ukita is the most emotional member of the Task Force. He mostly helps Mogi before being killed by the Second Kira.|
|Watari||In addition to being Ryuzaki's handler, Watari is also the supplier of logistics for the Task Force.|
|Aiber||Aiber is a conman hired by Ryuzaki to pose as Eraldo Coil in order to gain the trust of the members of the Yotsuba Group.|
|Wedy||Wedy is a cat-burglar hired by Ryuzaki for her infiltration skills, which are used to plant bugs in the Yotsuba Group Headquarters.|
|Sanami||Appearing only in the live action movies, Sanami is the sole female on the investigation team. She tends to Misa during her captivity in the second movie. She is shown to be more skeptical of the methods used by the investigation team, often calling them cruel.|