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Wizard Howl is a mysterious, reclusive wizard with a terrible reputation. He is known by a number of aliases; by birth, he is Howell Jenkins, but he goes by "Howl Jenkins" in Porthaven and his preferred "Howl Pendragon" in Kingsbury. When Howl was young, he gave Calcifer his heart in order for the fire demon to continue living because he felt sorry for him- this is implied to have sapped his humanity somewhat, and will continue to do so till he ends up like the Witch of the Waste. He is twenty-seven and known for being very flamboyant and "wicked". 

Source from Wikipeida