Musician in Chicago. Fell in love with Fiona Gallagher when she was a waitress at Patsy's Diner. They married a few days later spontaneously. Later she ends up cheating on him and he ends up writing the song 'Fuck you, Fiona' and sings the song to her in front of many people. Gus is friendly and cool. He's a little apprehensive about things. Doesn't know anything about Fiona. Tries to make a living. Can get freaked out easily. Loves Fiona. From the TV show Shameless (US). Season 6