Ibuki is slim, tall woman with short, messy black hair and dark eyes. She wears a plain white three-quarter sleeve tea-length dress with bateau neckline, and a pink bow. She also wear white flats.
She is kind showing concern to the Coppelion. Her baby's father is Tarou whom Ibara met and identified because he was listening to the conversation during Ibuki's delivery. She is compassionate and kind and even though she stayed in Tokyo for 20 years, she still missed the place.
She has a boyfriend which is the father of her baby. They were close but their relationship is unknown to her father nor friends. His name is Tarou. He is special to her to the point that Ibuki asks if Ibara and Haruto could find him during their diversion so that she can meet him and survive together.
She seemed to be attached to Taeko because of Tako helping her many times including when she was giving birth, Taeko was the one doing the operation.
Her babies are twins - one male and female. Because Taeko helped her deliver the babies, she wants Taeko to name both of them. Since Taeko hesitated to do so, Ibara quickly suggests that she'll name them instead. Ibara named the male baby as "Riku" (陸 lit. land) and the female baby as "Sora" (空 lit. sky).