Puck was an otaku follower of the AI Deus (one of the "Whites") and a founding member of Jackpoint, where his past was a constant point of contension. Although his otaku powers faded they re-emerged and he became a Technomancer (also he never confirmed this himself). MCT eventually captured him and conducted experiments. His current whereabouts are unknown but he has been off Jackpoint for several years. After breaking free again, he returned to Jackpoint. He joined Harlequins vendetta against Ghostwalker, and was involved in the events that occured in Denver, leading towards the duell Immortal Elf vs. Great Dragon.
It has also been heavily implied that Puck was instrumental in the release of the worm that caused Crash 2.0 when Deus was fighting Maegara and Mirage.
Edit