In the Voodoo religion, Loco (also spelled Loko) is a loa

Loa

The Loa are the spirits of the voodoo religion practiced in Louisiana, Haiti, Benin, and other parts of the world. They are also referred to as Mystères and the Invisibles, in which are intermediaries between Bondye —the Creator, who is distant from the world—and humanity...

, patron of healers and plant

Plant

Plants are living organisms belonging to the kingdom Plantae. Precise definitions of the kingdom vary, but as the term is used here, plants include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The group is also called green plants or...

s, especially tree

Tree

A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...

s. He is a racine (root), and a Rada Loa. Among several other Loa he is linked with the poteau mitan or centrepost in a Vodou peristyle.

He is the husband of loa Ayizan

Ayizan

In Vodou, and especially in Haiti, Ayizan is the loa of the marketplace and commerce.She is a racine, or root Loa, associated with Vodoun rites of initiation...

, and just as she is the archetypal Mambo (priestess), so her husband Loco is considered the first Houngan (priest). As the spiritual parents of the priesthood he and his wife are two of the Loa involved in the kanzo initiation rites in which the Priest/ess to be is given the asson (sacred rattle and tool of the priesthood), and are both powerful guardians of "reglemen," or the correct and appropriate form of Vodoun service.