She is a little girl, with short brown hair and brown eyes. Evidently she bore a close semblance to Lana, Shahal's younger sister, as he kidnapped her after mistaking her for Lana.
She wears a long-sleeved, dark pink dress with ribbons tied at the arms and a large, black ribbon at her throat. The dress has white, ruffled hems and additional black ribbons at her waist and a large one at the back. She also wears simple, dark pink slippers.
Riko is caring and sympathetic towards Shahal, even though she was kidnapped by him. Upon being found by Yuu, she explained that she felt sorry for Shahal because he used to be human.
Riko's history was not given. At some point, she is kidnapped by a vampire named Shahal for unknown reasons.
Guren assigns a mission to Shinoa squad to rescue Riko from Shahal and return her to her family.
- Riko [桜内] means "Jasmine Child".