Mütten Kylegate is a major character in On the Way to a Smile, "Episode: Shinra". Kylegate is described as a man in his thirties wearing a worn navy blue army jacket with a sturdy build. Kylegate is a former lieutenant in the M1: Shinra Electric Power Company army and was born into a rich family. According to Verdot, because of his wealth Mütten was never required to serve in the army, but chose to anyway. He came under heavy criticism for his actions, including excessive brutality and torture, and thus was never promoted beyond lieutenant. Kylegate invades Rufus Shinra's refuge in Kalm with a mob and takes him prisoner in his mansion.
Over time, Rufus reveals his plans for a new city on the outskirts of Midgar, and gives him passcodes to Shinra warehouses for supplies. Kylegate gathers people to begin construction of the city, telling Rufus he intends to govern it himself. He was shot dead by one of his followers, a former friend of Kylegate's who grew tired of his irate pompousness and selfishness, after talking with Rufus, who was subsequently rescued by Kilmister.
In Final Fantasy VII Rebirth, there is a man in a suit in Kalm calling himself "Baron Kylegate". 