In "The Golf War," Franz and the other Lilliputtians were discovered by Dipper and Mabel Pines. After explaining what they were and the purpose they served there, Mabel told him and the other Dutch about her rival Pacifica. Right away he understood about rivalry seeing how every Lilliputtian faction were rivals. After all the Lilliputtian factions battled, they all competed to help Mabel beat Pacifica, with which ever faction supporting the best getting the golden sticker from Mabel which they all were eager to have.
After seeing that the Miner Lilliputtians might apparently win, he and his fellow Dutch Lilliputtians kidnapped Pacifica, intending to kill her, solving Mabel's rival problem. However, Mabel didn't accept this and ate the golden sticker. In spite of this, all the Lilliputtians banded together to "cut her open to get the sticker." In the end Mabel saved Pacifica, and she, Pacifica and Dipper escaped, much to the dismay of Franz and the Lilliputtians.
As the Pines family drive home, Franz is shown to have somehow climbed onto the back of their car, clinging to the license plate. He vows revenge against Dipper and Mabel, but is flung off when the car hits a pothole, and lands headfirst into a sand trap.
Franz has a rather cheery attitude. Like the other Dutch Lilliputtians, he loves singing, so much he would get saddened when others wouldn't listen, as when Mabel and Dipper politely turned it down. Though nice, he shows a bad side towards the Pirate Lilliputtians, being enemies.
However he is dangerously competitive and will resort to any method to win or to receive a reward.
Franz wears Dutch-styled clothing including clogs. He also has bowl cut blonde hair and indigo skin. Like the other Lilliputtians, he has a head that resembles a golf ball.