Gunther is Baxter's younger, taller, thinner twin brother. He is a major protagonist of the Super Baxter series. Gunther has helped and fought alongside his brother on many occasions. Throughout his life, he has lived in Baxter's shadow, developing both cowardly and heroic tendencies. Baxter Sider marks his first appearance in the Baxter series and his debut in general. Originally a palette swap of Baxter, Gunther was created to facilitate a second player option. Since the two-player mode was dropped from most main Super Baxter games beginning with Super Baxter Land: The Lost God, Gunther has gained his own identity and personality. This is especially noticeable in installments for the Gunther's Mansion series of games, as well as the Baxter & Gunther series.