William or Will was a fire Half Demon of an unknown sub type, most likely Igneus or Aduro. He lived in North America during the 19th Century. Sometime prior to the events of the short story Bamboozled he became a member of Nathaniel Cooper's Gang. Will was in fact a plant, who gathered information on Nate and his mate Lily for fellow fire Half Demon Theodore Stewart. He acted as if he was not used to being around women when in fact he was attracted to lily, when he believed her to be dead he intended to rape her as she was still 'warm' but was stopped by Theodore.
Their plan to capture Nate for an unspecified party was foiled and Will was killed after Nate Changed into a wolf and tore his throat out.