Gaston is a character from Beauty and the Beast (1991 film), a Disney animated film.
He desires Belle.
Not much is known about his background. He's implied to have grown up in the town that Belle and Maurice live in and has garnered a positive reputation with the townsfolk.
Gaston has been infatuated with Belle for an unspecified amount of time. Around the start of the movie, he decided that he was going to marry her. When Belle turned him down, he became angry and insisted that he was going to marry her no matter what. He got the idea to threaten to throw Maurice in the insane asylum unless Belle agreed to marry him. However, once he learned that Belle is in love with the Beast, he got the town to form a mob to go after his "rival", and even attempting to kill the Beast.