Whimsicott is a small, brown, bipedal Pokémon. A mane of cotton-like fluff covers its back, neck, and forehead. Behind it is a green, star-shaped section similar to where a stem or vine meets a fruit or flower on a plant. Whimsicott's face features orange, oval-shaped eyes and its face is flanked by a pair of green-colored lobes shaped like curled horns or ears.
Whimsicott can manipulate its body to pass through cracks, no matter how narrow. It takes advantage of this ability as a notorious prankster, moving things and leaving cotton balls behind. However, should it get wet, it will be too heavy to move and answer for its pranks. Despite weighing 14.6 lbs (6.6 kg), Whimsicott appears capable of "riding upon the wind" but whether this means they actually generate whirlwinds themselves or get carried by wind currents remains unclear. Whimsicott likes to spend time in the sunlight in order to grow its cotton, though it will tear off and scatter the cotton should it start to build up too much.
Whimsicott also appears as a trophy exclusive to the 3DS version.
Ever found a white ball of fluff you couldn't quite explain? That was likely the work of a Whimsicott. Slipping through the tiniest of cracks like the wind, they like to move furniture around and leave little fluff balls all over the place. Though they look like sheep, they're actually Grass types, and their fluff is more like cotton than wool.
Whimsicott and Lilligant can be seen as counterparts. They share a base stat total of 480, are part of two-stage evolutionary lines, and evolve using a Sun Stone. Additionally, Whimsicott is exclusive to Pokémon Black, Black 2, Sun, and Ultra Sun, while Lilligant is exclusive to Pokémon White, White 2, Moon, and Ultra Moon.
Whimsicott is based on a fully bloomed ball of cotton and a sheep; the connection appears to be made because both cotton and sheep produce clothing material. This association with sheep is reinforced by Whimsicott's inclusion in the Unova horoscope. Designer Atsuko Nishida has also humorously mentioned the Genghis Khan (also known as Jingisukan), a Japanese grilled mutton dish, as an inspiration. Whimsicott may also draw some origin from the Vegetable Lamb of Tartary, a mythical "sheep-growing" plant used to explain the production of cotton in the Middle Ages.
Whimsicott's behavior as a windswept wandering plant seems to be based on tumbleweeds. Furthermore, it displays a mischievous side akin to impish creatures from folklore like the Brazilian Saci; both are brown creatures that live in forests, ride on winds, and play pranks. Its whimsical nature and windborne properties also make it similar to a variety of fairies.
Whimsicott may be a combination of whimsical and cotton.
Elfuun may be a combination of elf and 風 fū (wind) or typhoon.