She doesn't know anything about running a temporary office service. But she's so cute and petite. Olga took another slug of her coffee. Her red hair was natural but didn't look natural. You don't want your minor character to overwhelm your main character so you need only give him or her a single dominant character trait.
Experts insist that flashbacks are dangerous.
They interrupt the flow of the current problem. But the reader must know about the heroine's background somehow. Anything that halts the progression of the story is bad. 6.Write a scene revealing a side of the personality through self-realization. 10.Reveal something about the protagonist by description.