Puck is a prominent character in the anime series Re: Zero kara Hajimeru Isekai Seikatsu. He is a powerful spirit contracted to Emilia, one of the main protagonists. Puck appears as a small, cat-like creature with the ability to transform into a giant beast under certain conditions. Despite his cute and playful demeanor, he is fiercely protective of Emilia, often stepping in to protect her from harm. Puck plays a vital role as both guardian and friend to Emilia, supporting her in her journey and challenges.