"Helluva Boss" is an animated web series created by Vivienne Medrano, also known as VivziePop. The show follows a group of demons who run a small business called I.M.P. (Immediate Murder-Possession) that offers assassination services to clients in the living world. Each episode features their chaotic adventures as they navigate various challenges and clients. The series is set in the same universe as another popular show, Hazbin Hotel, and is known for its unique animation style, dark humor, and diverse characters. The main characters include Blitzo, the ambitious boss, and his quirky employees, Moxxie, Millie, and Loona.