Sprites

May be indistinguishable from will-o'-wisps and fireflies at a distance.

This is NOT about sprite software technology.

Though often smaller than 30cm, they are sometimes and depicted as large as a human child. They may also be as small as a fly or even smaller. Historically and popularly, they have a tendency to cause mischief and/or annoyance. They are often associated with water, sometimes air, of the traditional 4 elements. Although associating them with fire is not totally unheard of.

Pixies are commonly the same or nearly indistinguishable from sprites and therefore share this tag. In case they're of the variety without wings and such, use something else.

The tag name was chosen to be sprite as that word has fairly unambiguous usage even if rarer than the other forms. However, pixie and faerie are varyingly used for much different things thus are confusing, not to mention faerie actually refers to all kinds of fae rather than this particular kind and is best left for the broader concept.