Kyō Yahagi, nicknamed "Crusher Kyō," is a prominent character originating as a member of Team Asteroid (AL4) within the Foo Fighter organization. His initial characterization centers on extreme arrogance; he frequently refers to himself as "The Great Kyō" and displays a belief in his superiority as a Vanguard fighter. This attitude, combined with ambition to surpass the team leader Ren Suzugamori, fueled internal rivalry despite his position as the fourth-ranked member. Recruited alongside Asaka Narumi, Kyō demonstrated raw power to earn his place, defeating Asaka in their initial match. However, Ren perceived greater potential in Asaka, fostering Kyō's resentment and covert scheming against Ren. His signature deck utilized the Spike Brothers clan, focusing on aggressive tactics through superior calling units like Sky Diver and Dudley Dan to enable multiple attacks per turn. His iconic vanguard was General Seifried, often announced with the phrase "The Great Kyō rides General Seifried!" – a style mirroring Kamui Katsuragi's and provoking Kamui's ire. A pivotal defeat by Kai Toshiki at the national tournament led to his expulsion from Foo Fighter. This loss triggered a mental breakdown, driving him to wander the streets before forming "Team Avengers" with other exiled members. His goal shifted to revenge against Kai and Ren, aiming to conquer the national tournament independently. This vendetta culminated in a loss to Aichi Sendou at the Kanto regional tournament, thwarting his plans. During the Asia Circuit saga, Kyō resurfaced with "Project Yeti," disguising himself as an abominable snowman to lure and defeat prominent fighters, including Kai. This plan involved sabotaging global participants to attract Kai to a snowfield for a final showdown. Despite his resolve to fight to the death, Kai rescued him from an avalanche. Kyō bitterly vowed future vengeance before retreating to a jungle base. Later, he attempted to hijack Souryuu Leon's plane to infiltrate the Japan stage of the Circuit, employing a strategically chosen Megacolony deck featuring Martial Arts Mutant, Master Beetle to counter Leon's Aqua Force tactics by preventing units from standing. Although effective initially, he ultimately lost due to running out of resources and reverted to Spike Brothers. In the manga continuity, Kyō's portrayal includes greater nuance. After losing to Aichi, he exhibits an inferiority complex and temporarily allies with him to confront other Foo Fighter bosses. He employs a Nubatama deck (later adapted into Murakumo cards in the TCG) centered on disrupting opponents through cards like Left Arrestor, Right Arrestor, and Dueling Dragon ZANBAKU, which prevent the vanguard from standing and block grade 3 rides. This deck reflects a more calculated, control-oriented style contrasting with his anime aggression. He later succumbs to PSY Qualia corruption, becoming antagonistic again. The V Series reboot depicts Kyō as a minor antagonist in the first arc, retaining his ambition to usurp Ren. After losing to Aichi, he quits Foo Fighter and suffers deletion from the Vanguard system. His subsequent arc involves regaining his connection by settling a grudge against Rekka Tatsunagi, whom he defeated after ten prior losses. In this continuity, he uses a Murakumo deck. Kyō reappears in the *G* series alongside former Asteroid teammates, fighting against Team TRY3 with a Spike Brothers deck focused on the "Charge" mechanic and featuring Rising Nova. His battle record across media shows consistent losses against top-tier fighters like Kai, Aichi, Leon, and Ren, though he achieves victories against lower-ranked opponents and in group battles during the Link Joker arc. His development fluctuates between vengeful antagonist and a figure grappling with failure. His deck choices—Spike Brothers (offensive rush), Megacolony (control), and Nubatama/Murakumo (disruption)—reflect his tactical adaptability and shifting motivations.