Pixies

Pixies are small fairy-like creatures that resemble human females in the show. The most commonly known ones are those which live in Pussywillow Hollow -- the Pussywillow Pixies. There is also a male pixie named King Goldenrod, whose daughter Periwinkle is very vain and beautiful. They seem to grow like humans; for instance, Acorn is just a child while Elderberry is, as her name hints, an old pixie.

Empath: The Luckiest Smurf stories
Pixies in the EMPATH: The Luckiest Smurf story series tend to differ according to their region of origin, with the Pussywillow Pixies primarily being a single-gender species while Periwinkle and King Goldenrod belong to a two-gendered species of pixies. All reproduction is primarily non-physical, as they tend to sprout from buds on special plants.