Peppino repeatedly showed his extraordinary versatility; particularly noteworthy are his performance in Il Guardiano by Harold Pinter and in The Miser by Molière (as Harpagon), where he proved to be a skillful actor whose ability had grown beyond brilliant and dialect plays.
Dunin is one of the characters in the Italian novel "Il Guardiano dei Sogni" (The Guardian of Dreams) by Paolo Maurensig (ISBN 8-80-454976-9).