Uta Outa is a first-year Tensho Academy student without club affiliation, sporting distinctive pink hair at the front and black at the back, alongside black eyebrows and dark magenta eyes. His standard uniform includes a red tie, white undershirt, and brown pants, frequently paired with pink shoes featuring yellow laces. He consistently wears a knee-length white coat with pink accents, loosely draping its long sleeves over his hands, and occasionally dons gray half-hexagon glasses while writing lyrics.

Spontaneous and carefree, he acts on impulse—dashing into the ocean mid-conversation, appearing suddenly on rooftops, or composing lyrics unexpectedly. Despite playful antics, he shows deep loyalty, supporting friends readily. His whimsical curry obsession surfaces in hunger-induced claims of shrinking "until the wind blows him away." He eagerly joins taste tests, adopting puppy-like mannerisms to request "bow-wow curry."

As lyricist for the unit Sakutasuke (with Saku Otonomiya and Sosuke Kagura), inspiration strikes him unpredictably—watching Saku walk away or observing Satsuma Kadonooji eat honey toast. His occasionally perplexing lyrics shape the unit’s musical identity. He carries curry packets as a "secret weapon," supplying Saku after a spill during a trip. His works include "ひらめきッ☆響くよ! うーたんソング" and Episode 6’s insert song "START!!".

Childhood friend Sosuke Kagura collaborates with him on music and daily life, supporting Uta’s creativity—which "flows" during inspiration—though sometimes exasperated by antics like endless "volcano" singing. Uta forms Sakutasuke after recognizing Saku’s vocal talent, aiding Saku’s search for supernatural White Shadows to help hospitalized sister Nozomi. At the hospital, Uta identifies Nozomi by referencing Saku’s red-bean-paste curry recipe. Alongside Sosuke, he discovers White Shadows are drawn to songs, resolving a key plot point through a collaborative performance that summons entities and cats.

He participates in events like curry battles and karaoke sessions, assists in organizing performances, and voices philosophical musings—noting all people are "alive right now" but will "all be dead in the future," while suggesting lighthearted ideas like matching outfits. His name reflects his artistry: "Uta" means "poem/poetry," and "Outa" combines "journey" and "field."