Jack

Jack (パンプキング, Pumpking), self-proclaimed Czar of Halloween, is a character from the whose species is unknown (Possibly "Specter"). His Japanese name, Pumpking, reflects his self-given title, which is a portmanteau of 'Pumpkin' and 'King'. He appears once a year for Halloween from 6:00 PM until 1:00 AM the following day. He distributes spooky furniture, which can only be obtained through him. He wears a pumpkin on his head which, during Halloween, makes him indistinguishable from other villagers in the town who will also ask for candy. Jack, like all other holiday-related characters, was absent from, as was Halloween and candy.

In Animal Crossing
In, he will be somewhere in town during Halloween. Unlike the other villagers, who wear the same clothing as him, he will not chase you. This is the same for Mayor Tortimer, who on the night will give the player a model of Katrina's tent. Upon talking to Jack, he will give the player an item of sspooky furniture in exchange for candy. Doing this throughout the event will complete the set.

In
Jack really doesn’t appear in Wild World, but does appear in the jack in the box which is part of the Nursery theme.

In
Jack returns in with Halloween and candy. He was announced on the Japanese website for City Folk, along with other characters. His role remains the same as in Animal Crossing, and he now calls himself the Czar of Halloween. He sends a letter out to players earlier in the month, warning of his arrival, and telling them to have candy ready. Nook's store starts selling candy on the 1st of October.

Spooky Series
Jack gives a piece of furniture every time the player gives him candy. All the furniture pieces look like pumpkins or Jack O'Lanterns. They are orange and, like all holiday-exclusive furniture sets, score very highly with the Happy Room Academy.
 * Spooky Wall
 * Spooky Carpet
 * Spooky Bed
 * Spooky Bookcase
 * Spooky Lamp
 * Spooky Wardrobe
 * Spooky Sofa
 * Spooky Chair
 * Spooky Dresser
 * Spooky Vanity
 * Spooky Table
 * Spooky Clock
 * Spooky Paper

Jack O'Lanterns, Jack-in-the-Boxes, and Ragged Shirts are arguably considered part of the Spooky Series. There is also a Spooky Shirt, which is not given to the player by Jack, but by Gracie or Wisp.

Trivia

 * One easy way to find Jack is to dig holes in front of everyone's house before 6:00 PM so they can't get to you... Or just wear a matching outfit.

Gallery
Below are some images, including the letter given to players by Jack, warning of his arrival.