TV-Series
Description
Beast Zanzo is a significant transformation of Zanzo Kazai, the ancient and formidable leader of the Eight Imperial Ninja in the anime Ninja vs. Gokudo. This specific form emerges not as a separate character but as a physical manifestation of Zanzo's overwhelming rage following a deeply traumatic event. With a history stretching back approximately 384 years to the Edo period, Zanzo is the oldest and strongest ninja in the setting, possessing a unique and powerful physique known as the All-Form All-Ability. This innate ability allows him to alter his appearance, gender, age, and physical stature, making him a master of disguise and a nearly unbeatable fighter.

The Beast persona is driven by a powerful and sorrowful motivation. It appears after the murder of Kaiza Akiba, a person of immense importance to Zanzo. Kaiza was not only a fellow ninja but also his ideal partner, particularly in the realm of technique development. Zanzo describes himself as adept at development, which involves turning one thing into two, but he struggles with invention, or creating something from nothing. In Kaiza, he found the high creativity he lacked, making her death a profound personal and professional loss that pushes him past his emotional limits.

In terms of personality, Zanzo is fundamentally driven by a strong sense of justice and a deep care for his comrades, having secretly gathered allies for centuries to protect ordinary people from the Gokudo. However, his role as a leader also requires him to be shrewd and, when necessary, ruthless. The Beast form represents the raw, unbridled extreme of this nature, where his characteristic composure is replaced by pure, violent fury. While his other transformations, such as the Blonde Beauty he often uses at the groups hideout or the various personas for espionage, are tools of precision and deception, the Beast is a weapon of pure destruction. His role in the story is therefore a pivotal one, marking a moment where the ancient ninja leader abandons subtlety for direct, devastating action against those who have harmed his close ally.

Zanzo's relationships are long and complex, stretching across centuries. His oldest and most fateful bond is with Bansuiin Chobei, who was once his great friend and partner in protecting the peace of Edo. Their relationship soured dramatically, leading to the Great Fire of Meireki, a historical catastrophe that sparked the eternal war between ninjas and Gokudo. His connection to Kaiza Akiba is more contemporary and collaborative, and her death is the direct catalyst for the Beast transformation. Even his many disguises reflect his intricate understanding of human relationships, as seen when he transforms into a deceased baseball fan to destabilize an opponent or takes the form of a prostitute in post-war Tokyo to gather intelligence on the Gokudo.

The development of Zanzo into the Beast is a key part of his character arc, showing that even a being who has lived for nearly four centuries is not immune to the rawest forms of emotion. It highlights the depth of his bond with his comrades and the terrible price of his endless war. His abilities in this form, as in all others, are derived from his All-Form All-Ability. While the Beast transformation itself does not grant new techniques, it is the vessel for his immense power, channeling his rage into physical combat. His broader arsenal of copied ninjutsu includes devastating attacks like the Ninja Hand: Dark Blade, a piercing hand technique that moves faster than sound, and the Ruyi Staff, which allows him to freely extend his forearms. He can also combine copied abilities, such as using Return of the Old Arm and Young Fire to swing his extended arms and throw scorching skin fragments. His tactical genius remains, allowing him to employ hypnotic techniques like the Divine Punishment Inferno Cave, which he used to extinguish an opponent's survival instinct. In his Beast form, however, these sophisticated techniques are likely secondary to sheer, overwhelming physical force, making him one of the most dangerous entities in the world of Ninja vs. Gokudo.