Gō Reietsu is a central character known as the second-in-command of the Kimengumi, a reputation he has earned as the group's most aggressive and physically powerful member. His family background is rooted in commerce, as his relatives operate a sake store, and he resides in his uncle's household. Despite being underage, this connection to the family business is occasionally reflected in his behavior through the consumption of alcohol, which leads to bouts of intoxication. Academically, he has faced notable struggles, a common thread among his friends, requiring three attempts to pass the high school entrance examination.

Physically, Gō is most recognized for his characteristically large and prominent eyes, a trait that has earned him the persistent nickname Manako no Gō, which translates to Eyeballs Gō. His personality is a study in contrasts, built on a volatile and hot-tempered foundation. He often reacts to provocation with immediate aggression, is quick to fight, and can display jerkish tendencies, including the use of underhanded tactics to win, which positions him as a morally ambiguous figure within the group. However, this rough exterior consistently gives way to a genuine and fierce loyalty toward his fellow Kimengumi members. He demands respect for his friends and will not tolerate anyone mocking them, embodying the archetype of a jerk with a heart of gold. This duality also manifests in his relationship with the group's leader, whom he does not always treat with the expected deference.

He channels his considerable aggression and physicality into a deep and abiding passion for professional wrestling, a hobby that heavily influences his actions and fighting style. Gō's role within the Kimengumi is largely that of the enforcer and the primary source of muscle, often acting as the temperamental but loyal strongman during the group's many misadventures. In terms of key relationships, his dynamic with Chie Uru, the strong-willed best friend of the main heroine, is particularly notable. Their similarly hot-headed and confrontational personalities lead to frequent clashes and mutual irritation, yet this friction is often portrayed with an undercurrent of romantic tension, or ship tease, suggesting a deeper attraction, particularly from Gō's perspective. While he champions the Kimengumi's philosophy of confidently expressing one's unique personality, he is not a leader but a fiercely protective pillar of support.

Beyond his raw strength and wrestling-inspired moves, Gō, like his companions, possesses notable and often inexplicable abilities that operate on the logic of comedy. He and other members of the Kimengumi have demonstrated reality-warping powers, allowing them to perform improbable feats such as walking on water for humorous and exaggerated effect. His character remains remarkably consistent across all official media, including the original manga, the anime series, feature film, and sequel manga, where he continues to serve as the hot-headed but reliable heart of the Kimengumi's chaotic escapades.