In Celtic tradition, the king of the fairies is often referred to as Aengus or Elphin, although figures may vary by region. These characters embody the magical and sometimes capricious nature of fairy folk. The king is typically portrayed as a figure of great charm and allure, possessing powers that reflect both protection and mischief. The king's role is significant in overseeing the interactions between the mortal realm and the fairy realm, serving as a guardian of the mystical balance in Celtic mythology.