Lord Gennon is a high-ranking noble in Chuder. During the early days of the Band of the Hawk, he hired them for a number of jobs. A notorious pedophile, he developed an attraction for Griffith, which culminated when Griffith agreed to sleep with him in exchange for funds to support the growing Band. He is often seen to be attended by many very young male servants, no older than being in their teens. Gennon's voice was done by Masashi Oki in the Japanese version of the original anime and Fred Velde was his English voice actor.
Gennon later rose to become Governor of Doldrey. When General Boscone reveals that the Band of the Hawk's leader is Griffith, his obsession starts to cloud his judgement, which would eventually lead to his defeat.
When the Band of the Hawk attacked Doldrey as part of Midland's regular army during the One Hundred Years War, Gennon became so obsessed with capturing Griffith to the detriment of his greater military objectives. Chuder lost the battle, in large part because Gennon overrode the military command structure and took direct control of Chuder's forces, which was all in Griffith's plan. In his final moments, he pleaded with Griffith, telling him that all he wanted was to have him back. This plea fell upon deaf ears as Gennon was killed by Griffith after the main part of Chuder's army fled the battlefield following the death of General Boscone at Guts's hands.