Jack

Jack (パンプキング, Punpukingu, Pumpking), self-proclaimed Czar of Halloween, is a character from the whose species is unknown. He appears once 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.

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 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 spooky furniture in exchange for candy. Doing this throughout the event will complete the set.

Animal Crossing: City Folk
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 Chair
 * Spooky Dresser
 * Spooky Vanity
 * Spooky Table
 * Spooky Clock
 * Spooky Paper

Items obtained by approaching Jack without having any candy are arguably considered part of the Spooky Series, but are actually not. These items include:
 * Pumpkin Sead
 * Moldy Shirt
 * Patched Shirt
 * Jack-in-the-Box

Trivia

 * Jack resembles a boss in The Legend of Zelda: Oracle of Ages named Pumpkin Head.