Ui is a fair-skinned teenager of average build. She has neck-length, wavy brown hair with bangs covering her forehead. Her lips are often curved in a slight, cat-like smile. In her trion body she wears the standard Operator uniform.
Ui maintains balance within her unit. She is a positive influence on Kuniharu Kakizaki, gently urging him when he vacillates. Contrary to his fears, she does not resent him for their losses. She seems to speak to him in a more informal manner than their other teammates and addresses him by his nickname followed by the honorific -san, while he might use her first name without honorifics, suggesting that the two are close. Her informality extends to how she addresses Fumika Teruya and Kotarō Tomoe by their first names without honorifics, which implies that they are on good terms.
As the Operator of a moderately successful B-rank unit, Ui is probably a competent multi-tasker. During her unit's match against Tamakoma Second she has proven herself very alert of their opponents' positions, giving them timely warnings which allowed them to react to incoming attacks. She was also the one to suggest expanding the unit's formation, addressing its most glaring flaw.