Though mainly given a background appearance (then retconned), we can see that Gwendolyn bears a striking resemblance to her mother at her age, similar with Kenny to Ben. The resemblance primarily consist of a Native American complexion, black hair, brown eyes, and her frail figure. Although she has her long, black hair kept in a ponytail. The outfit she has been wearing during her minor appearances is a blue colored dress with white stripes on it's center. Though by an inch or two, she seems to stand taller than her brother, Kenny. (Possibly meant to be his elder sister).
This section needs expanding. You can help by adding info.
In Ken 10, Gwendolyn was seen at Ken's 10th birthday party along with Ken's friends.