Sawara Harumi, the 19-year-old eldest daughter of the Harumi family, balances university studies with assisting their generational fish shop, Uoharu. Her name "Sawara" evokes the Japanese Spanish mackerel, tying her to the family's maritime livelihood, while "Harumi" merges "clear/sunny" and "sea," reinforcing her oceanic connection.

She possesses short orange hair, orange eyes, and a notably voluptuous figure at 164 cm tall with measurements of B84/W58/H80. Typically seen in an apron at Uoharu, she favors colorful clothing during personal time. A characteristic ditzy smile and frivolous air define her appearances.

Despite striking looks, Harumi's personality defies expectations: she displays pronounced laziness, delegating minor tasks like fetching the TV remote to her younger sisters. Her air-headed speech often cools initial admiration. Yet beneath this lies deep trustworthiness and kindness. She acts as a maternal figure within her circle, showing unwavering devotion to her sisters' well-being.

As the eldest of three sisters, she performs idol duties in the subunit Sanbon Ribbon alongside Kajika (14) and Shinju (10), embracing their theme of "a little girl somewhere inside your heart" to emphasize youthful innocence. Harumi's nurturing and protective instincts anchor their interactions, revealing her latent responsibility beneath a lackadaisical exterior.

Within the broader idol group 777☆SISTERS, Harumi embodies the "variety" talent archetype. She joined as the tenth member and participates in group activities alongside subunit commitments. Her portrayal consistently underscores the duality of comedic laziness and genuine kindness. Her April 1st birthday coincides with April Fool's Day as an incidental trait.