A genius of the highest caliber. He has brown hair and dark eyes. With his handsome and likable appearance, he is popular with people of all ages and genders. He does not drink or smoke. He consistently ranks first in national mock exams, and his academic ability is so formidable that he managed to enter university with a perfect score in every subject while handling the events of being Kira. He is also exceptionally athletic, having trained as a tennis player. His computer knowledge is extensive, allowing him to easily hack into the National Police Agency database on his father's PC or overhaul the investigation headquarters' systems. Beyond mere academic talent, he possesses extraordinary reasoning skills and initiative. Originally, Light was a pure and righteous person, but he felt bored with his repetitive daily life. As he falls into corruption, his sociopathic tendencies emerge. Later, he uses even his own kind heart and actions as tools to achieve his goals, highlighting his descent into demonic depravity. After his corruption, Light becomes cold-blooded enough to be considered a completely different person. He is a calculating, prideful, and arrogant individual with a strong desire for recognition. He looks down on everyone and seeks to dominate them. Furthermore, he is quite violent. If anyone defies him, he will try to make them submit by any means necessary. However, he becomes sweet when treated with kindness.

A Shinigami (God of Death). He is visible only to those who touch the Death Note that Light possesses. He hates boredom and loves interesting things. He loves apples.

Light's friend and rival. He possesses an outstanding intellect and physical capabilities. He always speaks politely and is quiet. He has a gloomy aura. He always maintains an expressionless face.