Futaba is the middle Marui sisters in the Mitsudomoe franchise. She is extremely athletic, highly skilled at martial arts and has an infatuation with breasts.
Futaba is the middle triplet, extremely athletic and has the strength of multiple fully grown adults despite being an elementary school student. Futaba is also a talented artists and can often being seen drawing her favorite thing in world: breasts, a subject which she is intimately acquainted with and has doctorate-level knowledge of.
Futaba is a character in both Mitsudomoe anime series, Mitsudomoe and Mitsudomoe Zoryochu!, published by Aniplex with animation production by Bridge and the manga series Mitsudomoe, published by Akita Shoten and serialized in Weekly Shonen Champion. Futaba's original design is credited to manga writer and illustrator Norio Sakurai while her anime version is credited to Takaharu Okuma. Futaba makes her first manga appearance in volume 1 of the series and her first anime appearance in Mitsudome episode 1, "The Marui Family! The Good, the Bad and the Ugly!".