Kizaru joined the Marines at an unknown point in time, rising through the ranks to become an Admiral. His epithet, Kizaru, means “Yellow Monkey” and aligns with the Marine Admirals’ theme of animals and colors. His position as an Admiral has placed him at the forefront of critical Marine operations, where he enforces Absolute Justice.

Despite his relaxed and aloof personality, Kizaru’s immense power and loyalty to the Marines make him a key figure in their fight against piracy. His abilities and unwavering adherence to his duties were pivotal in significant events like the Sabaody Archipelago Incident and the Summit War of Marineford.

Kizaru is a tall man with a slim build, always seen wearing a yellow-striped suit, reflective of his epithet, paired with a Marine coat draped over his shoulders. His round sunglasses, perpetual grin, and casual demeanor give him an air of nonchalance, contrasting with the destruction he can unleash in combat.

Kizaru is known for his calm and carefree attitude, often speaking in a slow and casual manner regardless of the situation. This nonchalant demeanor masks his sharp intellect and merciless adherence to his duties as a Marine Admiral. He shows little hesitation in using overwhelming force to subdue his enemies, often showcasing his destructive capabilities with a playful tone, further highlighting his unsettling contrast between demeanor and power.

Sabaody Archipelago Arc
Kizaru first appeared as the secondary antagonist of the Sabaody Archipelago Arc, where he was dispatched to suppress the chaos caused by the Straw Hat Pirates and other Supernovas. His arrival demonstrated his devastating combat abilities, including his effortless defeat of several Supernovas and the complete incapacitation of the Straw Hats, emphasizing his overwhelming strength as an Admiral.

Marineford Arc
Kizaru played a significant role in the Summit War of Marineford, acting as one of the two secondary antagonists alongside Kuzan. His participation further highlighted his immense power, as he relentlessly fought against Whitebeard’s forces and maintained his composure throughout the chaotic battle.

Egghead Arc
Kizaru re-emerges as a major antagonist in the Egghead Arc, where his actions and decisions once again place him in direct opposition to the Straw Hat Pirates and their allies. His involvement underscores his continued prominence in the New World as a leading figure in the Marines.

• Sakazuki (Akainu)
  As Fleet Admiral, Sakazuki commands Kizaru, who follows his orders without question, though their personalities and methods differ significantly.

• Kuzan (Aokiji)
  Kizaru shares a history with Kuzan as part of the former Admiral trio, though Kuzan’s resignation distances him from Marine operations.

• Straw Hat Pirates
  Kizaru’s actions directly oppose the Straw Hats, particularly during the Sabaody Archipelago Arc and subsequent encounters.