Spiky

Spiky (Korean: 왕밤도치, wangbamdochi) is an Epic Pet that was released alongside its owner,, in the first half of the Jolly Winterland update. It creates Spiky Bear Jellies, which convert nearby Bear Jellies into more Spiky Bear Jellies when collected.

Story
''When Spiky curls up into a ball, everyone mistakes it for a chestnut still in its prickled flower. One fateful morning, Spiky accidentally punctured a tire on Chestnut Cookie's tricycle. They've become inseparable ever since. Sure, Spiky may nibble on the newspapers and ruin a tire or two, but they'll always be the best of pals.''

Trivia

 * Despite its Jelly having a similar effect to "Party" type Jellies, it is not referred to as a Party. The same applies to $π$.
 * Matching its owner, Spiky appears to be based on unopened wild chestnuts.
 * There used to be a bug in the Pet's skill summery that says that Spiky Bear Jellies are worth 15 points despite the value being more than that.