Based on available records, no information exists regarding a character named Nonno in the anime My My Mai. Documentation covers the series' plot, themes, production credits, and critical reception without mentioning this name. Character details focus exclusively on protagonist Mai, who operates a consulting business, and supporting figures like an unlicensed doctor with a wig and a superstar client. No other named characters appear in the provided context. Consequently, official My My Mai media contains no concrete details about Nonno.