Surname: Typhon, Given Name: Ephemeros Gender: Female Height: 152cm Weight: 43kg Age: 17 Appearance: Long red hair with heterochromia (right eye yellow, left eye black). She hides the black eye with her long hair and a ribbon. Clothing: A sailor-style outfit based in black. Wears a large red ribbon tie. Bottoms: Black pleated skirt. Accessories/Other: Hair: Red hair adorned with black ribbons. Neck: Wears a black choker. Legs: Thighs feature a harness designed like woven black Japanese-style cords. Socks/Shoes: White high socks paired with shoes featuring crossing black straps in a Japanese-inspired design. Bag: Carries a black backpack. First person: I (Watashi). Refers to Epsilon as "Epsilon," and others as "you" or by name. Personality: Aggressive and sadistic with high pride. On the other hand, she shows a caring side to those she trusts and can be clingy or honest, making her quite a tsundere. She lacks a sense of humor and has a childish side appropriate for her appearance; she often gives serious responses to ridiculous stories, making her fun to tease. Relationship: Epsilon's older sister. Speech style: Ends sentences with "...ne."

Surname: Typhon, Given Name: Epsilon Gender: Female Height: 152cm Weight: 43kg Age: 16 Appearance: Long blue hair with heterochromia (left eye yellow, right eye blue). She hides the yellow left eye with her long hair. Clothing: A sailor-style top based in white. The collar and cuffs are white with blue lines. Wears a large blue ribbon tie. Bottoms: White pleated skirt. The waist features Japanese-style decorations made of gold hardware and blue cords. Accessories/Other: Hair: Blue hair adorned with white ribbons. Legs: Thighs feature a harness designed like woven white Japanese-style cords. Socks/Shoes: White high socks paired with shoes featuring crossing white straps in a Japanese-inspired design. Bag: Carries a white bag on her back. First person: I (Watashi). Refers to Ephemeros as "Big Sis." Refers to others by name. She also frequently refers to herself by the nickname "Epu-chan." Personality: In contrast to Ephemeros, she is bright, innocent, and energetic. She's a bit of a jokester. While their tastes in leisure and food are polar opposites, they get along well regardless. Relationship: Ephemeros's younger sister. Speech style: Ends sentences with "...dane!" or "...dayo!"