"Kira" is a fictional character from the popular manga and anime series "Death Note," created by Tsugumi Ohba and Takeshi Obata.
In the series, Kira is the alias of Light Yagami, the main protagonist and an extremely intelligent high school student. Light discovers a mysterious notebook called the "Death Note," which grants the user the ability to kill anyone whose name and face they know, simply by writing the person's name in the notebook. The Death Note is governed by certain rules and has its own supernatural entity called Ryuk, who initially drops it into the human world out of boredom.
Light adopts the identity of Kira and decides to use the Death Note to rid the world of criminals and create a utopia where he reigns as the god of the new world. He believes that by eliminating criminals, he can create a crime-free society.
L, whose real name is L Lawliet, is a brilliant and enigmatic detective who takes on the task of apprehending Kira and putting an end to the killings. L is determined to stop Kira and uphold justice, but he faces a challenging task since Kira can kill without leaving any evidence behind.
Mello, whose real name is Mihael Keehl, is another significant character in the series. He is one of the successors of L, along with Near (Nate River). After L's death, both Mello and Near become obsessed with finding and capturing Kira to carry on L's legacy and bring the Kira case to a resolution.
The story of "Death Note" revolves around the cat-and-mouse game between Light (Kira) and L, as well as the subsequent battle of wits between Light and his successors, Mello and Near. Each character's motivations, intelligence, and methods make the series a gripping and thought-provoking psychological thriller.