Guru Bunbuku is a mysterious figure appearing in the anime. He initially appears as an eccentric, absent-minded scavenger of coins, living frugally in a windowless shack to avoid expenses. His personality emphasizes extreme frugality, meticulously rationing small resources and boasting about minor accomplishments. This behavior, however, is partially a facade concealing a more serious and capable nature. Observant individuals note advanced martial arts skills, like minimizing damage when thrown and leaving no attack openings during mundane actions such as eating. His background involves mentoring the protagonist, Gao Mikado. After Gao is nearly consumed by the Thunder Lance X Tempest Buster, Guru Bunbuku appears, instructing Gao's friends on recovering Gao's Miracle Life to revive him. Following Gao's recovery, Guru Bunbuku is challenged to a Buddyfight by Gao and defeats him effortlessly, revealing his status as a Hall of Famer Buddyfighter, a recognition of elite skill. He subsequently agrees to train Gao and his friends, providing strategic advice and organizing Buddyfights for their development. During this training, Guru Bunbuku discloses the significant revelation that Batzz's destruction of Dragon World occurred under the control of Wisdom's ancestor. Later, he tasks Miserea with investigating disappearing monsters, leading to the discovery that Chaos Control Company is transforming monsters into CHAOS Monsters. After Brutal of the Martial Arts defeats Miserea using Overkill, Guru Bunbuku devises a plan to create a new Mirage Card to counter Wisdom. He gathers ingredients and enlists Baku and Noboru's help at the Mirage Shrine. The creation process requires Guru Bunbuku to expend part of his life force, leaving him severely weakened. Wisdom confronts them, demanding the Mirage Card, but Guru Bunbuku refuses and initiates a Buddyfight. Despite a strong effort and destroying Gear God VII, he loses to Wisdom's Geargod VIII. The Mirage Shrine collapses due to violence violating its sanctity, trapping Guru Bunbuku under debris. He gives the Mirage Card to Gao and orders Batzz to evacuate him, seemingly perishing in the collapse. Guru Bunbuku later reappears alive, having escaped through a dimensional hole at the last moment with Kiri's assistance. His return surprises the group, leading to emotional reunions except with Batzz, who destroys Guru Bunbuku's grave in frustration. His abilities include exceptional Buddyfighting prowess as a Hall of Famer, keen senses for spotting distant objects, and creating inter-dimensional portals with bare hands. Closing these portals requires significant energy comparable to the X Tempest Buster's power. He possesses extensive knowledge of Miracle Life and methods to counteract weapon-related corruption. Additionally, he documents and illustrates legendary Buddyfights, compiling detailed records that impress expert deck builders. His capacity for deception allows him to project a harmless image, often leading others to underestimate him. In the card game, his monster card ability boosts another monster's power, defense, critical, and abilities when discarded from hand.