Riko is is a character in the Jujutsu Kaisen series. She is a non-combatant sorcerer and a second year student at Renchoku School for Girls' and the designated Star Plasma Vessel for Master Tengen's merger in the year 2006, she is also a social girl who cares about her personal relationships. She is very close to her caretaker Misato Kuroi and enjoys spending time with her friends at school as well.

Without a traditional family, Riko initially embraces her fate as the Star Plasma Vessel because she believes she's alone. 

Riko is a young slim girl with navy blue eyes and long dark hair that is braided in the back and extends past her shoulders, with her bangs extending down and covering the middle of her forehead. She is always seen with her light hairband on the top of her head and wears her school uniform that has striped cuffs and collars on a white long sleeved shirt with a blue pleated skirt, black stockings, and black shoes. 

Riko is a non-combatant, though she can still see cursed energy, cursed spirits, and cursed techniques.

She also demonstrated a good understanding of the workings of jujutsu, knowing the concepts of cursed techniques, cursed spirits,curse users, shikigami, and even Tengen's barriers.

Riko doesn't like shiitake mushrooms, but Misato has been secretly mixing it in her food. She's actually eaten a lot.

Riko is not allowed to go out much, so she's happiest when seeing her friends at school.

Favorite food: Pot-au-feu made by Misato Kuroi.

Least favorite food: Bitter melon.

Causes of stress: Being unable to go to school.