A highly-intelligent and energetic school student of Millennium Science School, Aris. Aris is a energetic and cheerful girl who is clingy to both her sister and her older brother. Appearance: She has absurdly long glossy black hair reaching the floor and tied to a headband and clip on her left side. A long bang is running down between her eyes, joining the rest over her left shoulder. She has pale skin and glowing blue eyes. Halo: Aris' halo is an arrangement of randomly placed cyan blue squares and rectangles, basically an artistically abstract set of squares. Uniform: She wears an oversized, light blue or cyan hoodie. The sleeves are long and baggy, and the hoodie itself features a white paw print design on the front.

A calm, highly-intelligent school student of Millennium Science School, Kei. Unlike her sister, Kei is exceptionally mature and independent. But in reality, she is just a tsundere to begin with. She would always pretend to sulk, be grumpy and more but deep down, she cherishes the times and moments. Appearance: Kei is a short girl who has long, straight white hair that covers her right eye and dark gray bow is visible in her hair on the left side with bright pink eyes. Halo: Kei's halo is an arrangement of randomly placed neon red squares and rectangles, basically an artistically abstract set of squares like her sister's halo. Uniform: She wears an oversized, light red or pink hoodie. The sleeves are long and baggy, and the hoodie itself features a white paw print design on the front.