Una Meredith was the younger daughter of John Knox Meredith and the younger sister of Faith, Jerry and the older sister of Carl Meredith. She had long black hair, dark blue eyes with an aura of sadness about them, and a mouth which occasionally falls open to reveal small, square white teeth. Occasionally, a shy smile creeps over her face. She was the only Manse child who attempts to keep the Glen St. Mary Manse tidy, and seems to care more about what others think of their way of living more than her siblings. She was also the most caring and thoughtful of the Manse children. Sshe was the one to care for Mary Vance when they rescued her from the barn.
Una missed her mother more than her siblings do, and seems to be sensitive about death. Una was thought to have a carefully hidden fancy for Walter Blythe and this was reinforced in Rilla of Ingleside. Rilla Blythe seems to be the only one to have noticed this, as she ends up giving Walter's last letter to Una. At the end of Rilla of Ingleside, it says vaguely that Una intends to take a course on Household Sciences at Redmond, most likely to get over the great dissappointment in love that she has experienced.