Matt is intelligent, being known as the third smartest child at Wammy's House, though he was not a successor to L. His specialty is technology.
He is shown to have a dry sense of humor; asking, "Since when were the Japanese allowed to have such big guns?" while standing at gunpoint. In the manga, Matt's hideout is shown to be littered with junk food and a box of cereal. According to Death Note: How To Read 13, Matt likes video games and dislikes going outside.
He is voiced by Tomohiro Nishimura in japanese, and by Drew Nelson in english.