Student at Aglionby Academy (former)
Matthew is not a biological child of the Lynch family, but is instead the product of Ronan's ability to bring objects (and people, obviously) from his dreams into reality. Ronan brought Matthew out when he was three, and is unaware for the first half of the series that Matthew came from his dreams.
Not a lot is said about Matthew in the first novel, only that he is one of the three Lynch brothers and that he asked Ronan's friends to come to church for Easter once.
He gets far more screentime in The Dream Thieves, in which he has multiple scenes with his brother(s). It is revealed that while Declan and Ronan do not get along at all with each other, both of them care for Matthew deeply, and he is the reason they attend church together every Sunday. Likewise, Matthew cares deeply for both of his brothers and never appears to take one side or the other in their feud.
Ronan is fiercely protective of Matthew and the climax of The Dream Thieves involves Ronan, Blue, and Gansey rescuing Matthew after he is kidnapped by Joseph Kavinsky, a drug-using delinquent who seems obsessed with Ronan and can also take things from his dreams.
It was revealed in the third book (Blue Lily Lily Blue) that Matthew is in fact an accidental dream creature of Ronan's, much as Aurora Lynch is a dream creature of Niall Lynch's. After Declan informs Ronan of this fact, Ronan begins attempting to find a way to keep dream creatures and persons awake even after the death of their dreamer.
In The Raven King, Ronan and Declan throw a small going-away party for Matthew's benefit. Matthew and Declan have to temporarily move to DC because of the dream dealers coming to investigate Piper Greenmantle and her Demon. At the end when the Demon attempts to unmake Ronan and his dreams, it's noted that Ronan's phone is buzzing like crazy with texts and calls from Declan. It can be assumed that Matthew was also showing signs of being unmade like Opal was. It can also be assumed that he survived since Opal lived due to Gansey sacrificing himself to kill the Demon. We never get confirmation of this, however. He will likely be mentioned in the Dreamer Trilogy, so we'll probably know for sure when it comes out.
Matthew is often described as happy. It can also be assumed he is very naive due to the fact Declan and Ronan had a small party at the Barns when Declan and Matthew had to move due to Greenmantle and the other Dream Dealers in The Raven King. The author has said he inherited all of Niall's charm and humour.
Matthew has curly blond hair and round, blue eyes, which are described as being more innocent-looking than the eyes of his two older brothers. He is a large kid, "a bear of a boy, square and solid and earnest", and he was pudgy as a child. Unlike Ronan and Declan, Matthew is often smiling or laughing.
- The Raven Boys (only mentioned)
- The Dream Thieves (first appearance)
- Blue Lily, Lily Blue
- The Raven King
- He and Ronan made a secret handshake
- He's the only person who can get away with calling Ronan pal
- He has perfect teeth framed by a dimpled smile
- He loves food of all varieties and quality
- He wears a great deal of cologne to church
- His ringtone is a song by Iglu & Hartly
- Before his father died he took lessons in multiple instruments including the Irish bouzouki (at which he is said to have been reasonably good) and the organ (at which, according to Ronan, he was terrible).
- Niall Lynch taught all of his sons to box, including Matthew
- He plays lacrosse or "something sweaty"
- Like his brothers, he loves cars
- He keeps his room neat and free of clutter
- After Declan moves to D.C., Matthew's roommate at Aglionby is a boy named Stephen Lee
- Every line of his dialogue throughout the books is directed at Ronan