According to legend, the púca is a deft shapeshifter, capable of assuming a variety of terrifying or pleasing forms. It can take a human form, but will often have animal features, such as ears or a tail. As an animal, the púca will most commonly appear as a horse, cat, rabbit, raven, fox, wolf, goat, goblin, or dog. No matter what shape the púca takes, its fur is almost always dark. It most commonly takes the form of a sleek black horse with a flowing mane and luminescent golden eyes. (The Manx glashtyn also takes on human form, but he usually betrays his horse's ears and is analogous to the each uisce)

If a human is enticed onto a púca's back, it has been known to give them a wild ride; however, unlike a kelpie, which will take its rider and dive into the nearest stream or lake to drown and devour him/her, the púca will do its rider no real harm. Púca are also known as great chefs, but only operate in their own village. However, according to some folklorists the only man ever to ride the púca was Brian Boru, High King of Ireland, by using a special bridle incorporating three hairs of the púca's tail. The púca has the power of human speech, and has been known to give advice and lead people away from harm. Though the púca enjoys confusing and often terrifying humans, it is considered to be benevolent.

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