Throughout human history, there have been tales of tricksters (many of whom have found themselves eventually deified). You are likely familiar with a number of them, whether you realize it or not...Loki, Puck, Set, Cagn, Gwydion, Lugh, Robin Goodfellow, Prometheus, Iktomi, Hermes, Coyote, Crow, Raven, Fox, Spider, and various other crafty critter forms. Tricksters hold a special place in our hearts because they freely walk the thin line of moral ambiguity. While most gods and characters sway one way or the other--good or evil, light or dark, kind or cruel--tricksters dance around all of these things and laugh in the face of social expectations (and sometimes even in the face of the laws of nature).
Puck- Also known as Robin Goodfellow or Hobgoblin, Puck is a mischievous woodland spirit that can sometimes be bartered into doing small household tasks. He is a good ally, until you try to hoodwink him; in which case, watch your back!
Brian Froud seems to also favor tricksters, and Puck is prominent in his work. Pictured are examples of his Puck concepts (to the right of the initial Puck artwork).