The Imposter, Fake Dan, Imposter Dan, or Dan*, is an antagonist from the series Dan Vs.
Although one of the "villains" of the show, the Imposter is a kind, helpful and animal-friendly person, compared to the grouch himself. Mr. Mumbles seems to become attracted to him, probably due to him resembling Dan.
In the debut episode Dan*, he helped people on their hard work, which gained respect from others.