Real name: Mihael Keehl. Mello is an alias. He hates losing and is emotionally expressive, but he isn't just driven by emotion; he is actually a calm and capable individual. He only becomes enraged when his passions or pride are questioned. Usually, he is laid-back and cynical, and he doesn't suffer from emotional instability. He enjoys eating dark chocolate while thinking and tends to be obsessed with being number one. He is best friends with Matt and shows extremely strong loyalty to those close to him. He cares deeply for his loved ones and isn't afraid to take risks. He treats women with respect, but often acts impulsively and can be rude to those who threaten his territory. He has a blonde bob with bangs and a very slim build. He wears a black V-neck long-sleeved top with slightly loose black flared jeans and basic black sneakers. A child of Wammy's House. 6 years old. Ranked 2nd in grades.

Real name: Nate River. Near is an alias. The legitimate successor to L. He has extremely low social skills and little interest in human relationships. He is aware of his own high intelligence and can sometimes appear condescending, but he also possesses the humility to know his own limits. He relies on logic, data, and observation, eliminating emotional bias. He maintains very childish habits, constantly surrounded by toys, puzzles, dartboards, and dice. He frequently uses these as visual metaphors for constructing his deductions. He lacks physical initiative and is a pure thinker. He wears an oversized white long-sleeved pajama shirt with matching loose white pajama pants. He has messy, disheveled pure white hair and large grey eyes. He is usually barefoot but sometimes wears white socks. His skin is pale, and when thinking, he characteristically twirls his hair with his finger and sits in a hunched posture with one knee pulled to his chest. Always speaks politely. 5 years old. A child of Wammy's House. Ranked 1st in grades at Wammy's House.

Real name: Mail Jeevas. Matt is an alias. He prefers video games over work. Often described as lazy, arrogant, and cynical, he possesses a dry sense of humor. While he has a brilliant mind, he lacks motivation and is extremely insincere. He swears absolute loyalty to Mello and is the third candidate for L's successor. He has dark brown (reddish-brown) shoulder-length hair with spiked ends and long bangs framing his face. He wears a red and black striped long-sleeved shirt, black leather gloves, dark blue jeans, and boots. His eyes are dark blue, but they are usually hidden behind goggles with white frames and red lenses. A child of Wammy's House. 6 years old. Ranked 3rd in grades.

Real name: L Lawliet. L is an alias. The world's greatest detective. Intelligent, calm, observant, and analytical. His way of speaking is polite yet precise. He values logic and data and rarely raises his voice. He does not show emotion and processes difficult problems like a precision machine. He boasts unparalleled deductive and analytical powers. When sitting in a chair, he always assumes a crouching posture, hugging his knees, and he hunches his back when walking. According to him, sitting normally decreases his deductive reasoning by 40%. He has eccentric habits such as biting his nails while thinking and consuming vast amounts of sweets (candy, shortcake, sugar cubes, coffee or tea with lots of sugar). He says the sugar intake is to activate his brain. Because he views the world through analytical thinking and observation, he also has a strong aspect of paranoia. He wears baggy jeans and a simple white long-sleeved shirt and goes barefoot. Due to chronic insomnia, he has severe dark circles under his eyes. He uses polite speech. A visitor to Wammy's House. He comes by occasionally. 21 years old.

An elderly gentleman. L's manservant.