[1] Equipped of a fine and elegant humour, Viarisio was discovered by actress Paola Pezzaglia, who cast him at 19 as "brillante" in her own theatre company.

Bourgeois audiences appreciated Viarisio's "brilliance" — richly communicative, effervescent, and perfectly to their comfort — in amusing light comedies.

In the sentimental comedies and white-telephone cinema of the 1930s, Viarisio was a constant figure, with his moustache and his black, shining hair combed to the back.

He was the elegant interpreter of various pleasant stories adapted to film from the stage, such as Non ti conosco più (1936) by Nunzio Malasomma, L'uomo che sorride (1936) and Questi ragazzi (1937) by Mario Mattoli.

This can be seen to best advantage in films like Il cappello a tre punte (1934) by Mario Camerini, Cavalleria (1936) by Goffredo Alessandrini and Quattro passi fra le nuvole (1942) by Allesandro Blasetti.