Gaston is the main antagonist of Beauty and the Beast.
Gaston's role and personality in the musical based on the film is pretty much the same—a pompous, sexist, egotistical, boorish, brutish, brainless and misogynistic caveman who loves only himself. His ultimate goal is the same too—marry the prettiest girl in town and make her his "little wife" and his "property". Instead of ignoring the Bimbettes like in the film, he pays more attention to them (saying that their 'rendezvouses' will continue after his marriage to Belle, implying adultery) but still wants Belle as his wife, making them very upset (to the point of wailing and crying like infants instead of sobbing like in the movie). During the proposal scene (where there's no wedding party outside unlike the movie), Gaston gives Belle a miniature portrait of himself as a present. In addition to the song Gaston, the song Me is performed by him (in which he conceitedly proposes to Belle). The song is of interest because one verse implies that his feelings for Belle are more than for her looks (he even calls her 'pumpkin' as an endearing appellative), but he never says it outright to her. Like in the movie, he dies after falling off the roof of the Beast's castle, but not before fatally wounding him after arrogantly lying that Belle sent him to the castle to kill him.
Notable actors who have played the role on Broadway include Burke Moses (who originated the role on Broadway and in the original London production), Hugh Jackman (original Melbourne production), Marc Kudisch, Christopher Sieber, Cody Carlton, and Donny Osmond (singing voice of Li Shang in Mulan). Other actors include Steve Condie.
Gaston gets a second song, Me, which can be heard in the musical and in New Fantasyland. The song serves as a (rather conceited and sexist) marriage proposal to Belle, taking the place of the proposal scene in the movie where he has a wedding set up outside Belle's house without her prior knowledge.