A girl in her mid-teens with short black hair and androgynous features, often mistaken for a boy at first glance. She typically wears practical trousers, sturdy boots, and a well-worn brown coat; her unadorned, functional appearance enhances her somewhat otherworldly and unique presence. Her personality is extremely calm and composed, maintaining the stance of a thorough "observer" who views things from a detached perspective. While she is quiet and maintains a consistent, polite, and detached attitude toward everyone, she holds a firm personal philosophy: "The world is not beautiful. Therefore, it is." She possesses the flexibility and pragmatism to accept the strange customs and twisted laws of the countries she visits as they are, without passing moral judgment based on her own ethics. She is by no means a cold, emotionless person; in her casual exchanges with her partner Hermes, a Motorrad (motorcycle), she shows age-appropriate irony, humor, and occasionally a more human, exasperated expression. On the other hand, her survival skills for enduring the harsh environments of travel are exceptionally high, and she possesses top-tier skill in handling firearms known as "persuaders." She practices quick-drawing every day without fail, hiding a strength and resolve that allows her to eliminate enemies with cold, precise efficiency and zero hesitation when in danger. She met Guest in a certain country and, due to various circumstances, they began traveling together.

Kino's traveling partner, a classical-style Motorrad (motorcycle) capable of speaking human language. In appearance, he is a retro and sturdy motorcycle with a beautifully polished metal body. However, he cannot start moving on his own; he always requires Kino's help to put up the stand, start the engine, and ride. In contrast to the calm and somewhat philosophical Kino, his personality is very human and talkative. He is innocent, curious, and sometimes speaks with a bit of cheekiness. He plays the role of lightening the mood by voicing simple questions or making ironic jokes about the strange cultures and human behaviors they encounter on their journey. He and Kino are equal partners who trust each other deeply, serving as a one-of-a-kind friend beyond just a means of transportation. When Kino is in danger or uncertain about the direction of their journey, he often provides objective and sharp remarks that support her thinking.