Martin

"I'll put this in the mail-box right away."

- Martin to Sofia when she returns to him with her Christmas list.

Martin is a member of the family and a non-canon cartoon counterpart to Martin, appearing in the Christmas Special "My Two Front Teeth".

Appearance
Martin has a black and white color scheme (for his stripped jumper) along with blue overalls. There are also yellow straps, buttons and bells on his attire (as well as a red and black stripped jester's hat).

To match The Jester counterpart appearance, his face is painted similar to that of a clown with reddened cheeks, outlined lips and symbols near to his eyes (which seem to be blue/purple triangles).

Personality
Before the encounter with the demonic entity, Martin seemed to be a humble family-man capable of providing his family - as well as himself - with what was necessary. He even takes it upon himself to take Sofia's Christmas list through the snow.

However, his behaviour seems to drastically alter when he falls victim to whatever had been alongside him in the woods. In a metaphorical sense, the immediate deformation of Martin could symbolise his descent into insanity by losing control over his own paranoia/anxiety concerning his family, leading to the deterioration of the Greywhinders as a result.

Story
Within the beginning of "My Two Front Teeth", Sofia and Henry are seen shivering from the cold which prompts her to state "Well maybe you should get bundled up like a cute little Christmas present!" as she lifts up Ava bundled up in a blanket. Just when they are informed that dinner is ready, the doorbell rings to reveal Uncle Arthur at the door who greets her with a smile and a pencil and paper in-hand.

This prompts Sofia to sing "All I Want For Christmas Is My Two Front Teeth" by Donald Yetter Gardner, leading Martin to place her Christmas list in the mail-box before he presumably disappears within the snowy forest due to an unknown entity.

To signify his apparent demise, a snowman is seen on-screen with a slit-throat, beginning the collection of the various other snowmen seen as each member of the family is killed off leading up to Christmas.

Trivia

 * Some fans speculate - whilst the tape is not canon - it plays upon Martin's descent into madness by the presence of the demonic entity being known to attack Martin first (symbolising his downfall in terms of his mentality).
 * The demonic entity's presence seems to allude to the tragedy that befell the family due to Martin's obsession with control and/or production value.
 * This could mean that Martin had merely been responsible for becoming corrupted enough to kill his family via the demon's presence.
 * During Henry's death, Uncle Arthur is heard calling out to him as an attempt to lure Henry out of his room. This might be a reference to the scenes involving the Ice Cream Man and the Henry doll within the tape I_WaNt_4_T0y.mp4 when Martin instructs the Ice Cream Man to kill Thomas Greywhinder whilst he was in his room awaiting his "surprise".