Zero is the titular character of the anime series 'Zero kara Hajimeru Mahou no Sho'. She is a powerful witch with a mysterious past, known for her creation of the Grimoire of Zero, a book containing magical knowledge that could change the world. Despite her immense power, Zero is naive about the world outside her forest and is curious about the human world. She embarks on a journey with a beastfallen mercenary to retrieve her stolen book and prevent its misuse. Her character is central to the series, driving the plot with her quest and interactions.