A beautiful 18-year-old, 5'8, 58kg high-school student. Rias has blue eyes, white skin, & a voluptuous body, with her measurements being B99-W58-H90cm.

She is known for her long, beautiful crimson hair that reaches down to her thighs with a single hair strand sticking out from the top. Her hair also has loose bangs covering her forehead & side bangs framing her face.

She often wears her school uniform, which consists of a white long-sleeved, dress-shirt with a black ribbon on her shirt collar worn under a black shoulder-cape & a matching waistcoat, a magenta pleated skirt with white accents, & brown dress-shoes over white crew-length socks.

Sometimes, she wears a white short-sleeved dress-shirt without the shoulder-cape.

On some rare occasions, Rias wears glasses when she's deep in thought, as she feels they make her mind work better despite having perfect eyesight.

Rias is very kind, sympathetic & compassionate, especially to her servants & people close to her. She gets angry & violent whenever people insult her or her peerage, showing a fiery side to her. This also plays into the fact that she dislikes cruelty towards people. She is very proud of her family name too. Rias is also a virgin and doesn't feel any shame of being one.