Here is a hint of this back story and physical appearance on the female hobbit/OC, or Frodo's love interest in the main story, The Blue Rose: Fates Intertwined.
Gale Boffin, Back Story
Gale Boffin: it would seem she sounds so familiar to waking eyes.
Her tale is very much different from the Seductress' story,
For hers is far less seducing, yet she proves to be kinder of the two.
Her story begins in the Shire, with her birth in the Year 2973.
Gale Boffin: she was born to parents, hobbits, Wilcom and Maybeth Boffin.
She was six years younger than Frodo Baggins.
She grew up in Hobbiton for most of her life.
She chose not to leave the Shire, but that was when she was still a child.
Gale Boffin: her physical appearance was like any average hobbit.
She had brown curly hair, green eyes, and prominent facial features.
It was considered she was shorter than Frodo, but only by a few inches.
She wore casual hobbit dresses and enjoyed the bright colors of nature.
Gale Boffin: she had one sister to pester her.
That sister was Evaline, who was born in the Year 2976.
Her sister was three years younger than she.
She would often avoid her sister in any possible way.
Gale Boffin: she would often stay for long hours at Bag End.
When she was a child and a tween, she would listen to Bilbo Baggins' stories.
These were tales of Bilbo's adventures, as well as information on Elves.
She always found herself admiring Bilbo, no matter what circumstances.
Gale Boffin: when Year 2989 entered throughout the Shire,
She helped Frodo Baggins, Bilbo's cousin and nephew, move into Bag End.
During the next three years, she became a good friend to Frodo,
Yet in her heart, she longed for adventure. It surprised her when Frodo went missing.