Matt, whose real name is Mail Jeevas, is a consort of Mello’s. A character in the manga and anime versions, Matt was also a former resident of Wammy’s orphanage; Ohba described him as the “third most talented member” of the house. Matt is Mello’s helper as Matt performs espionage work and acts as an accomplice in Takada’s kidnapping, which results in his death when he is shot by Takada’s bodyguards. He is voiced by Tomohiro Nishimura in the Japanese anime and by Drew Nelson in English dub.

According to How to Read, Matt enjoys video games and isn’t outgoing. He also seems to be a chain smoker. He uses his last breath to smoke his cigarette. He is also behind Near and Mello in succeeding L.

Ohba said that he created Matt because when Mello started to act alone Ohba believed that he would find difficulty in advancing the story unless Mello had a character to interact with. Ohba said that to a reader Matt may appear to play video games and have no other actions, but he said that Matt’s existence was “important” in the story. In response to a question inquiring about which characters the creators had the most difficulty creating, Ohba cited Matt and said “I didn’t even know what kind of person he was!”

Obata said that he did not receive advance notice regarding Matt, who had the character concept of “a young man who loves gaming and doesn’t really care much about the world.” Obata said that he remembered seeing the thumbnails and asking his editor “Who’s this character?!” The thumbnails gave Matt a bowl haircut and goggles; Obata instead drew “what I liked.” Obata added that he could “create Matt naturally” as he had a “he probably won’t do much” mentality regarding characters introduced in the Near and Mello arc. His birthday is February 1, 1990.
From Wikipedia