Ume is the youngest child in the Noyamano family, being only 10 years old, and thus is more doted on among the sisters. She keeps to herself for the most part, playing with her weird dolls, which she apparently makes herself. Her personality is more quiet and passive as compared to her aggressive sisters, and she seems to have eccentric tastes. She wears a strange eye patch in her hair and is often dressed in long-sleeved dresses that is much too large for her it seems. As with the other Noyamano sisters, she dotes on Ikki like a part of their family, though Ringo is the only one to have stepped from a brotherly-sisterly love to a romantic relationship in the family.
Though she is the weakest of the Gravity Children, she can easily defeat Ikki in the Tropheum, due to her being accustomed in fighting in 0G, though, this was in a comical context and therefore, her true capability is unknown. She is often bullied on by Ikki, which she often hold grudges, but loves him all the same. She introduced Ikki to the 'Sensei' who designed Kogarasumaru's emblem and Team Shirts.
It has been confirmed that Ume is a Ring Road rider, and it is likely that she could use it in an offensive manner like Kanon does. Her skill with technology is shown to be of extraordinary standards, from creating a 'rocket AT' for Ikki early in the manga (which was scrapped due to her not being in her right senses at that time) to creating strange spiderlike robotic machines which she uses to travels on. Her speed is shown to be on par with genius Tuner Kururu, as they both repaired the robot they were riding on the second it was dismantled by a Time Road user.