Charles and Mambo

Charles and Mambo (voiced by: Dana Hill then Pat Musick, following Dana Hill's death, and E.G. Daily) are Duckman's Siamese twin sons.

They are child geniuses whose heads share a body. They view Duckman as a subpar and inadequate father (both true assessments), but love him anyway. Duckman can rarely seem to remember Mambo's name and has called him everything from "La Bamba", "Mandingo", and "Simba", to "Gumbel" to simply "Charles' brother." In later episodes, occasionally one will attempt to commandeer their shared body.