Mauro Entrialgo Ibarrondo (born in Vitoria in 1965) is a Spanish artist, who has developed a multifaceted career as an illustrator, musician and above all cartoonist. Among its most popular characters are Herminio Bolaextra, El Demonio Rojo and Ángel Sefija, on whom he has produced a varied merchandising. As an illustrator, he made film posters, music festivals ("Festimad") and album covers. He has also worked as scriptwriter for other authors such as Alvarortega or Calpurnio, as well as for animation (Cuttlas, various spots), cinema (Pez people, 2001), television (Paramount Comedy) and theater (Herminio and Miguelito). As a musician he has been part of the groups Fat Esteban and Esteban Light.