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Most of the time, Jack is a joyful, fun-loving and affable. Jack is a little naïve with his surroundings; when Tem died, he started to see how the herbivores began to have a little fear towards the carnivores, but he did not take much notice. He is worried about Legoshi, who, despite being a quiet wolf, has an appearance that tends to scare and intimidate others.

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Jack is a Labrador with a slender build, light yellow fur, and large brown eyes. He is typically seen wearing his school uniform, which consists of a white dress shirt with rolled-up sleeves, an indigo vest, a dark gray tie, black suspenders, gray pants with dark gray vertical stripes, and brown loafers. During the warmer seasons, the top-wear is replaced by a blue polo shirt. Jack also started wearing Legoshi's old clothes when Legoshi dropped out of school, even though they were too big for him.

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Jack (ジャック, Jakku?) is a main character in Beastars. He is Legoshi's close childhood friend.