What is kirby on frasier?

Kirby is a fictional character on the television show Frasier. He is the son of Frasier's radio station boss, Kate Costas. Kirby is portrayed as a teenage boy who is often seen as awkward and naive. He is portrayed as having a crush on Roz, Frasier's producer, in the early seasons of the show. Kirby is portrayed by actor Brian Klugman. He appears in several episodes throughout the series, mostly in minor roles.