Light Yagami is a university student who resents the crime and corruption in the world. His life undergoes a drastic change when he discovers a mysterious notebook, known as the "Death Note", lying on the ground. The Death Note's instructions claim that, if a humans name is written within it, that person will be killed. Light is initially skeptical of the Death Note's authenticity, believing it is just a prank. However, after experimenting with it and killing two criminals, Light is forced to admit that the Death Note is real. After meeting with the previous owner of the Death Note, a Shinigami named Ryuk, Light seeks to become "the God of the New World" by passing his judgment on criminals.

Soon, the number of inexplicable deaths of reported criminals catches the attention of the International Police Organization and a mysterious detective known only as "L". L quickly learns that the serial killer, dubbed by the public as "Kira" (derived from the Japanese pronunciation of the English word "Killer"), is located in Japan. L also concludes that Kira can kill people without laying a finger on them. Light realizes that L will be his greatest nemesis, and a race to prove mental superiority between the two begins.
(Taken from Wiki)

Picture	Role	Actor	Description
	Light Yagami/Kira	Tatsuya Fujiwara	Light is an extremely intelligent but bored 17-year old student. When he finds the Death Note, dropped in the human world by Ryuk, he decides to use it to kill all criminals and earns the title Kira. His ultimate goal is to cleanse the world of evil to create a utopia and then reign over this new world as its god.
	L/Ryuzaki	Ken'ichi Matsuyama	L is the world's top-rated detective, tasked with tracking down and arresting Kira. As such, he is Light's arch-enemy. His disheveled appearance masks his great powers of deduction and insight. L has many quirks, such as sitting in an odd manner, snacking on sweets constantly, and holding objects in a peculiar manner. He often takes drastic strategies to confuse and force the hand of his opponents. On several occasions he has willingly disclosed several of his weaknesses to Kira at the risk of his own life in the hopes that he would lure him into a trap.
	Misa Amane	Erika Toda	A girl with an immense crush on Kira, Misa is a popular idol in Japan. She is immature and tends to refer to herself in the third person in an attempt to be cute. Misa is completely devoted to Light, and she once said that she loved him at first sight. Light, however, only views her as an asset to his plans because of her Death Note and her Shinigami eyes (that she obtained at the cost of half of her remaining life span, twice). Misa devotes herself to Light because he killed her parents' murderer after several trials had failed to convict him.
	Ryuk	Shido Nakamura (Voice)	A shinigami who dropped a Death Note into the human world, which Light would pick up. Ryuk is not Light's ally, and in fact declares in their first meeting that someday he (Ryuk) would write Light's name into his own Death Note. Ryuk often refuses to aid Light and instead enjoys watching him struggle for his goals. He acts for his own interests and entertainment, and often fails to tell Light key details about the Death Note. However, Ryuk will aid Light if it serves his own goals, such as providing amusement or obtaining apples, without which he suffers a form of withdrawal symptoms.