"Bye, Bye Birdie"
Conrad Birdie would also be considered a male lead as well as Albert Peterson
Chip Tolentino, William Barfee, and Leaf Coneybear would be "leads"
"Man in Chair", Robert Martin, Aldolpho, George, and Mr. Feldzieg
(I'd consider them all leads, though some are bigger than others)
Bert and George Banks are the two that come to mind
Hope that helps!