Wu is one of Wenda's companions.
Birthday in Bewildering Balloon Bandit Burglary.
A recurring joke in the series is how Wu regularly loses his pants, exposing his white boxer shorts with blue spotson them.
Hwppens when he is stretched.
"I wish I'd quit losing my pants" after Wenda pulls him from quicksand and they are left behind.
Alien scares his pants off following his consultation in Big Book of Everything for extraterrestrial.