Akatora, meaning "Red Tiger" due to his coat, is a Kai Ken dog with red brindle fur, black stripes, and amber eyes. Artistic interpretations vary: some include white urajiro markings on his underbelly and muzzle, while others show a solid red coat without contrast.

As the eldest Kai Ken brother alongside Kurotora and Chutora, Akatora was abandoned in the mountains at roughly one month old. During their survival struggle, a predatory marten permanently injured Kurotora’s eye and tore Chutora’s ear before Ben intervened. Ben nurtured the brothers with food and guidance until independence. Even as puppies, the trio displayed combat prowess by collectively killing a threatening snake.

Akatora exhibits a quick temper and aggression but balances these with bravery, loyalty, and protectiveness as the trio’s leader. He remains the most level-headed, strategically retreating when necessary and showing vulnerability, such as grieving his brothers' apparent deaths. His dynamic with the mastiff Moss shifts from mutual insults to respectful camaraderie, later marked by the affectionate nickname "Grandpa Moss."

Four years after separating from Ben, the brothers encountered him leading an Ōu Army reconnaissance platoon. Unrecognized, they attacked until Akatora recalled Ben’s identity. Grateful, they joined Ben’s forces, assisting in recruiting fighters like Moss and the ninja dog Akame. Akatora assumed interim leadership during Ben’s incapacitation, directing tactics in conflicts including the clash with Moss’s group.

In the final battle against the demon bear Akakabuto, Akatora sustained catastrophic injuries: the bear’s claws destroyed his eye and tore through his face and chest. Sacrificing himself, he blinded Akakabuto’s remaining eye, enabling the Ōu Army’s victory and saving Ben’s life. He succumbed to massive blood loss and trauma. Accounts vary on injury extent—some specify loss of a foreleg alongside severe thoracic damage.

Posthumously, Akatora’s legacy endures through spiritual manifestations and family. Surviving characters, particularly brother Kurotora and nephew Kagetora, revere him as a hero. His spirit appears alongside fallen Ōu soldiers at pivotal moments: encouraging nephews Shouji, Buru, Dodo, and Shigure against Genba’s forces, and guiding Moss to the afterlife in a dream.

Reproductive accounts differ: some narratives cite mating with Minazuki, producing offspring including daughters Jane, Alary, Sara, Neira, and Tiana, plus son Kazetora. Alternate versions reference a relationship with Gin causing pregnancies, unverified in primary sources. His spirit reunites with Minazuki in heaven during daughter Sara’s vision.