Rosa presents as a grandmotherly, pink-skinned, bipedal axolotl-like creature with four arms, usually adorned in an apron and spectacles. She runs an inn in Bygone City, greeting travelers with a sweet, helpful facade. This kindness masks a profound hatred for humans, whom she views as inherently vile creatures deserving no mercy. Rosa believes exterminating them and harvesting their parts is morally justified, citing a history of human atrocities against non-human races—mockery, violence, and genocide. Upon learning Somali is human, Rosa betrays her, spreading the secret and knowingly putting Somali in grave danger. She openly relishes news of hunters planning to consume the child, displaying hypocrisy by condemning past human cruelty while enacting her own vicious revenge. Rosa embodies the cycle of hatred and moral blindness, remaining unrepentant and unchanged.