Willie Wilkins is a recurring character across adaptations of the Little Lulu franchise. He is consistently portrayed as a preteen boy and a member of "The Fellers" boys' club, identified as the group's strongest member.

He possesses short black hair. His typical attire features an orange cap, a green shirt, and orange knickers, though earlier depictions sometimes show him in a brown cap, red shirt, and gray knickers.

Within The Fellers, he actively participates in their schemes and adventures, often involving conflicts with rival groups like the West Side Boys or interactions with the girls led by Lulu Moppet. Comic depictions sometimes identify him as the president of the boys' club.

In the 1976 anime adaptation *Little Lulu to Chicchai Nakama*, his characterization includes being smart, good at academics, and well-behaved. This version frequently shows him accompanying Lulu on adventures and serving as a voice of reason when her plans encounter difficulties. He also displays a crush on Lulu, often blushing around her. A defining trait in the anime is his love for animals; he is shown rescuing and caring for strays, notably adopting a dog named Bobby despite his parents initially forbidding pets.

His role across different media remains largely supportive within the ensemble cast, contributing to group activities and conflicts.