Gouki Daimonji leads Team Handsome as a student of Tokyo Metropolitan Harumi High School, embodying a pirate swagger through his distinct attire: a red bandana, brown vest, orange and white torn shirt, red sash, baggy tan pants, and knee-length boots, complemented by medium-length black hair and piercing orange eyes. His personality is excitable and straightforward, if not deeply analytical, yet he commands respect as leader of Card Shop Voyage and eagerly seeks challenges against any opponent. His doting relationship with his younger sister Nagisa, whom he inadvertently spoiled, fuels comedic tension due to her persistent marriage proposals toward Kamui Katsuragi. This familial bond ignites a rivalry with both Aichi Sendou and Kamui, especially after Gouki misinterprets Kamui's bond with Aichi as romantic, leading him to accuse Aichi of being a "home wrecker" and challenge him to a cardfight. Gouki's competitive path spans regional and national tournaments. Early regional clashes saw Team Handsome eliminated by Team Q4 after his loss to Aichi. Later, Team Handsome fell to Team Avengers in the semifinals, blocking a rematch with Aichi. Prior to the V Series, he secured second place in the Asia Circuit Championship. During the Asia Circuit arc, Team Handsome recruited Kamui, though Kamui later returned to Team Q4 after losing to Aichi. Inspired by Aichi's limit breaks, Gouki incorporated similar tactics into his strategies, notably facing Kenji Mitsusada with a deck harnessing Cocytus's power-enhancing limit break. A significant shift occurred when Gouki was reversed, prompting him to blend Nightmist's Break Ride for superior calling with Cocytus "Яeverse" for unit locking and power boosts. Following this reversal, he lost decisively to Kamui in a critical match during episodes 141-142. In the V Series, he continued competing, securing a win against Misaki Tokura while suffering losses to Leon Soryu and Kamui; an outcome against Asaka Narumi remains unrecorded. As a dedicated cardfighter, Gouki exclusively wields Granblue clan decks, specializing in resurrection mechanics to retire and revive units from the drop zone. His initial strategy involved superior riding Guiding Zombie for early attacks before replacing it with stronger units, exploiting superior ride lines to conserve card advantage and unleash devastating megablasts like King of Demonic Seas, Basskirk's Bermuda Gate, calling up to five units from the drop zone. His decks evolved significantly: an early build centered on Basskirk and Monster Frank for superior riding; an Asia Circuit-era deck integrated Cocytus's limit break; and his reversed deck merged Nightmist and Cocytus "Яeverse." In the V Series, his Granblue deck maintained core resurrection tactics but adjusted trigger compositions, employing four Knight Spirit critical triggers. Gouki is renowned for dramatic ride chants, such as "Enter the fray from the Seven Seas! I ride the King of Tyranny! King of Demonic Seas, Basskirk!" and "Superior Ride Ice Prison Necromancer, Cocytus!", amplifying his pirate persona. His documented match history includes early wins against Aichi Sendou and Hiromi Sakyuin; losses to Aichi, Kyou Yahagi, Kenji Mitsusada, and Kamui; and undetermined results against certain opponents in later seasons.