Frank Hardy (35 Episodes)

Joe Hardy (35 Episodes)

Fenton Hardy (35 Episodes)

Aunt Gertrude Hardy (35 Episodes)

Iola Morton (35 Episodes)

Silas Applegate (20 Episodes)

Jackley the Plumber (20 Episodes)

Perry Robinson (20 Episodes)

Boles (20 Episodes)

Lacey (15 Episodes)

Eric (15 Episodes)

Mr. Binks (15 Episodes)