William Li is Wanda's younger brother. He is kind of mischievous. While he can walk and somewhat talk, he's being potty trained, sleeps in a crib, and drinks from a bottle. He appears in "Ups and Downs", "Under Construction" and "Meets Molly Cule" (in Wanda's fantasy).


William has straight black hair similar to his sister. He's most commonly seen wearing a red T-shirt and blue shorts.

In the new series, William wears a yellow T-shirt, blue overalls and white and blue sneakers.

 Episode Appearances


  • Lisa Yamanaka also voiced William along with his big sister Wanda.
  • He is aged up in the third series.
  • He is even more aged up in the new series.