Fudemushi is a supporting character in the manga series 'Tongari Boushi no Atelier' (Witch Hat Atelier). He is a unique, worm-like magical creature who serves as a familiar in the atelier. Fudemushi assists the apprentices, especially Coco, by providing magical ink whenever needed, and is known for his loyal and diligent nature. While he doesn't speak, his actions often help the young witches, making him an indispensable part of the atelier's daily life and magical activities.