Height 7 cm Puck is an Artificial Spirit that Emilia was formerly contracted with. He is the current Great Spirit of Fire.

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He is currently known as the Beast of The End.

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Around 400 years ago, Puck was created by Echidna, though he had apparently left her by the time she moved into the Sanctuary. Seven years before the start of the election, Puck unfroze Emilia and began to act as her friend and mentor, and later on started to live at Roswaal's mansion where he was reunited with Beatrice.

Puck can be described as cute or adorable, thus his skin being pink around his cheeks. His fur is mostly grey with silver in certain spots (i.e. tip of the tail). His eyebrows are pretty small and rhombus-shaped. He also has a gold earring on his left ear. Sometimes, he carries a purple bag. Puck is generally a nice spirit. He is very happy and stays at Emilia's side to protect her, affectionately calling her "Lia". He occasionally goofs around and gets along especially well with Beatrice.

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However, Puck's demeanor greatly changes in loops where Emilia dies, showing a complete disregard for anyone except her, and was even willing to destroy the world because of the condition in their contract.