Like most of the adult SuperFriends, Wendy has black hair and blue eyes. Her usual outfit consists of a red blouse with pink sleeves and a white collar, combined with white bell-bottom pants and white shoes.
Wendy is the niece of Harvey Harris, a detective who trained a young Bruce Wayne in becoming a master detective. This would explain why she would be a Junior SuperFriend.
As a Junior SuperFriend, Wendy's cleverness and resourcefulness made her invaluable to the other SuperFriends.
In 1977, after several years as a Junior SuperFriends member, Wendy moved to Paradise Island to attend an Amazon university and continue her training.
Two years later, Wendy returned with Marvin to aid the new Junior SuperFriends, the Wonder Twins, posing as Zan's and Jayna's human disguises, "John" and "Joanna", to fool a criminal who had deduced the Wonder Twins' and Batman's secret identities.
- Wendy Harris at the Super Friends Wiki