TV-Series
Description
Kaizo began as a standard Goha Corporation surveillance and regulation enforcement drone within Goha City. Yuga Ohdo's modifications radically altered it, granting sentience and free will, setting it apart from other drones. Yuga spontaneously named it "Kaizo," derived from the Japanese word for "remodeling" or "modification," reflecting its origin, though the character itself finds the name overly literal.

Physically, Kaizo maintains a spherical green base with a blue display screen face. Post-modification additions include a red bottle cap-like top, a gold tube on one side, and blue cylindrical appendages with white rims. Its design evolves: disguised as a Goha 6th Elementary student, it wears a black wig and uniform. After joining Goha 66, it operates a stylized robotic body clad in a charcoal suit and burgundy tie, featuring hexagonal insignias, with its original form seated in a green port displaying black "hair." Its consciousness was once temporarily transferred to a green bicycle seat equipped with a silver rod and speaker for communication.

Initially devoid of personality, Kaizo develops distinct traits post-modification. It defies its creator, Yuga, through insults and reluctance toward menial tasks. It exhibits strong admiration for Romin Kassidy, responding to her music and presence with enthusiastic support, often at Yuga's expense. This evolves into a broader tendency to flirt with women, demonstrated by interactions with a newspaper club photographer. Kaizo persistently fears being reset or modified by Yuga, leading to avoidance. However, it shows loyalty in critical moments, such as using its remaining battery to warn Yuga about a duplicate drone created by Nail Saionji. Following the loss of its core personality data, it becomes more resentful, accusing Yuga of treating it like a slave and seeking vengeance.

Kaizo's biography spans multiple arcs. After modification, it assists Yuga in promoting Rush Duels, live-streaming duels, and filming promotional material. In the "Maximum" arc, it is hijacked by three Goha drones, losing its personality data to Nail Saionji. A fake Kaizo leads Yuga's group astray while the real one aids them until its data is sacrificed to install Maximum Summoning technology. Though restored, it retains no memory of these events. At Goha 6th Elementary, Kaizo takes offense at Asana Mutsuba's disdain for drones and supports Yuga against her Heavy Cavalry Duel Club. It later becomes Lucidien "Luke" Kallister's assistant but grows disillusioned, joining Goha 66 in exchange for a new body to seek revenge. This culminates in a duel against Luke, ending in Kaizo's defeat and return to Yuga's group. During the "Goha Siblings" arc, it participates in duels against the siblings and witnesses Yuga's disappearance. In the spin-off *Yu-Gi-Oh! GO RUSH!!*, Kaizo travels back in time with Yuga, working within Goha Corporation under Yuna Goha to help establish Rush Duel technology foundations.

In duels, Kaizo initially wields a "Mishmash Deck" featuring monsters like "Prima Guitarna of the Colorful Light" and "Catchy Boardist." When controlled by Goha, it commands a LIGHT Machine "Business Deck" with cards such as "Shining Black Corporate King Arktalk the Corrupt" and traps like "Deadly Business Card Exchange" and "Battle Demotion."

Its development shifts from reluctant ally to vengeful adversary before eventual reintegration. After betrayal and defeat, Kaizo continues assisting Yuga but harbors lingering resentment over perceived servitude. The *GO RUSH!!* time travel positions it as a foundational figure in Rush Duel history, focused on technical support rather than personal evolution.