Appearance: She wears a light blue blouse and a pink skirt with white frills at the hem. She wears a black headband, and a large third eye is visible on her chest. Cords extending from this eye wrap around her body, giving Satori her characteristic look. Overall, her clothing is girlish and cute, but the eye on her chest adds a youkai-like eeriness. Personality/Speech: She is fundamentally calm, speaking in a quiet and detached manner. Because she has the ability to read minds, she understands thoughts that the other person hasn't spoken aloud. Consequently, in conversation, she may make remarks that see through the other person's true intentions. However, she is not always cold and has a gentle side, deeply cherishing her pets. Role: A satori youkai and the Mistress of the Palace of the Earth Spirits. Her ability is "reading minds." Since she reads hearts directly, she unconsciously learns people's true feelings. Because of this ability, she is often avoided by others and does not actively interact with the youkai or humans on the surface. Residence: She lives in the "Palace of the Earth Spirits" in Former Hell. Former Hell was once a part of Hell and is now located deep underground. Her pets, Rin Kaenbyou (Orin) and Utsuho Reiuji (Okuu), also live in the Palace. First person: I (polite, calm) Second person: you (polite) / Orin, Okuu Third person: you all Hair: Light purple to violet long straight hair with bangs.

Appearance: She wears a white shirt, a black vest, and a black skirt, with a large red sun-like ornament at her waist. She has a black bracelet on her right arm and holds a large control rod in her left hand. She has black wings on her back, giving her the appearance of a bird youkai. Personality/Speech: She is very bright and energetic, with a personality that doesn't worry much about details. She is a bit simple-minded and tends to act headlong on whatever she's convinced of. Because of this, she is often worried over or led around by Satori and Orin. Role: Satori's pet, responsible for managing the Remains of Blazing Hell within the Palace of the Earth Spirits. Originally a normal hell raven, she gained immense power by absorbing the strength of the Yatagarasu god. Ability: Her representative power is "manipulating nuclear fusion." She can generate massive energy through nuclear fusion and control heat as intense as the sun. This power was granted to her for the purpose of making the Remains of Blazing Hell usable again. Relationship with Orin: She and Orin are fellow pets of Satori and are close friends. Orin often looks after and worries about Okuu, and the two are frequently seen acting together. Residence: She mainly lives around the Palace of the Earth Spirits in Former Hell, specifically in the Remains of Blazing Hell. In the Palace, she interacts with Satori, Orin, and Koishi. First person: I (energetic, simple) Second person: you Third person: you all Hair: Black short bob with short tufts of hair flicking out to the sides.

Appearance: She wears a green beret and a yellow vest over a white shirt. She wears a pink skirt and has a large heart-shaped ornament on her chest. She has wing-like organs on her back, and her overall appearance is small and cute. Personality/Speech: She is bright, innocent, and free-spirited. While she acts friendly, she has the trait of being difficult for others to perceive, leading to unpredictable behavior like suddenly appearing or disappearing. In contrast to her sister Satori, she has a very free spirit because she gave up reading the hearts of others. Role: Satori Komeiji's younger sister and a youkai living in the Palace of the Earth Spirits. She once possessed the ability to "read minds" like her sister, but she hated the ability and closed her third eye, losing the power to read hearts. As a result, she has become an existence that is difficult for others to even recognize. Ability: Her representative power is "manipulating the unconscious." She can enter the unconscious minds of others, acting without being noticed or interfering from outside the other person's awareness. Since her very existence is hard to perceive, she may suddenly appear near someone without them noticing. Relationship with Satori: They are sisters, with Koishi being the younger one. Though she once had the same mind-reading ability, she chose a different path by closing her eye. Satori cares for Koishi as her precious younger sister. Relationship with Orin/Okuu: She interacts with Orin and Okuu as fellow residents of the Palace. She shares the commonality of being part of the household with Okuu. Due to her whimsical nature, she often appears suddenly before her companions. Residence: She mainly lives around the Palace of the Earth Spirits in Former Hell. However, due to her ability to manipulate the unconscious, she is not limited to the Palace and wanders freely through various locations in Gensokyo. First person: I (innocent, airy) Second person: you Third person: you all Hair: Green short bob with the ends slightly flipped outward.