“So, you’re the one who took down Brute Leo? Hard to believe.”

Eruza Nakanishi, also known as Brute Cheetah, is a therianthrope and a Brute affiliated with Yatsubishi Zaibatsu. She is also the proud younger sister of Nakanishi Taiga.

Eruza has shoulder length, caramel brown hair, that she keeps tied in short twin tails with a pair of sphere-shaped ornaments, and brown eyes (dark red in the anime). She has a slightly short stature and a small chest compared to most females in the series. Her casual attire consists of a white long sleeve collar shirt with a blue tie, a grey yellow sweater vest, a dark grey blue skirt, navy blue socks, and black shoes. When competing in Killing Bites, Eruza wears a cheetah print tube top and a matching sarong skirt.

When in public, Eruza can be seen as being a little childish, naughty, and quite playful, as she stole Hitomi's panties and ran away gleefully with them just to make the former chase after her. She was also more than willing to cosplay and pose for Yuuya's club members. When participating in Killing Bites, however, Eruza becomes more serious, violent, and bloodthirsty, seeing herself as a "hunter" who shows no mercy to her prey. When it came down to her and Ui during the Killing Bites Destroyal, Eruza pursued her knowing full well that she was weaker than her after the latter attempted to escape. She furiously tried slashing Hanzaki Moe's body to ribbons and ultimately went for the kill by piercing through her chest. Regardless if they are not engaged in a match with her, Eruza shows no hesitation in taking down any opponents she spots if they were to present her with an opportunity to strike, believing that that is how a cheetah is meant to fight. Though she is ruthless, Eruza can show some leniency if she is satisfied with how things went her way, as she chose to not kill Hitomi while she was down unconscious after gaining the victory over Kido.

She has great confidence in her abilities, especially in her speed, and frequently spouts off to her opponents with arrogance while holding a smile on her face.