someone who people laugh at because they seem silly or stupid.
She's fed up with being treated as a figure of fun and insists that her ideas deserve serious attention.
figure of fun
A person who is ridiculed or not taken seriously. Jesse became tired of being treated like a figure of fun so he changed his demeanor to be taken more seriously.
a figure of ˈfun
somebody who is often laughed at by other people: As a young man he was admired, but as an old man he became a figure of fun.