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Matt is usually a very quiet individual who isn't very outgoing. He only seems to talk with Mello who is his close friend as well as ally. Matt enjoys smoking, playing video games and cute girls (a reference to when he complains that Mello gets to keep an eye on Misa and not him). He dislikes going outside. Not very much else is known about his personality so he remains to be a very mysterious type of character.
- Matt makes his first appearance when he is speaking with Mello on the phone, telling him that Mogi and Misa were seen walking with eachother. (Volume 10 pg. 78, 79)
- While keeping an eye on Misa and Mogi all the while playing video games Matt begins to get bored of which he quotes "something that never changes" (Volume 10 pg. 109)
- Still monitoring Misa and Mogis movements via surveillance cameras in an apartment Matt fills Mello in on what is currently going on between the two. (Volume 10 pg. 135)
- Completely fooled, Matt falls into a bit of a problem when watching Misa and Mogi. He underestimates the fact that they were on a plane to Japan so Mello asks him to follow. (Volume 10 pg. 155)
- Matt assists Mello in his plan to kidnap Takada by tossing a smokescreen out of the window of his car, causing the bodyguards to lose Takada and begin their chase behind Matt. (Volume 11 pg. 205)
- Matt, still in pursuit by Takadas many bodyguards is completely surrounded to which he is gunned down relentlessly by the bodyguards dying a quick death. (volume 12 pg. 8, 9)
- Matt makes his first appearance in the anime when he tosses the smoke screen out the window of his car which allows Mello to kidnap Takada. (Ep. 35 - Malice)
- After he is surrounded by Takadas bodyguards, the pursuit between them and him ends and he explains that he was behind the kidnapping all along but is gunned down by Takadas bodyguards where he smokes his last cigarette before passing away. (Ep. 35 - Malice)
Matt had a lot more of a role in the manga compared to the anime. While he is still considered a minor character in both the anime and manga there wasn't much shown of him in the anime. Despite being a minor character, he has a huge fanbase.
Before his debut in the anime, Mail was drawn by fans as having red hair, yet in the anime he has greenish-brown hair.