Miguel Berzosa was a regular contributor to Ipurbeltz for which he created the character 'Mintxo'. Publisher Erein launched this children's magazine in 1977 in order to foster the use of the Basque language. Berzosa illustrated a comic about the Basque bard 'Iparraguirre' for the same publisher. In the 1980s he teamed up with scriptwriter Harriet to create 'Titez', a series featuring a couple of criminals in contemporary Bilbao. It consisted of the books 'Gentuza' and 'Muerte de un Camello', both published by Ttarttalo. He also contributed to Habeko Mik and El Diario Vasco. In 1985 he was present at the Spanish version of Creepy with the short story 'El Héroe'.
Later on Miguel Berzosa specialized in drawing biographies of saints and beatified persons, such as 'Ignacio de Loyola' (1990) and 'Francisco de Javier' (2002), which he did for publisher Mensajero.