Billie

Billie is a character from Pinky & The Brain. She is a lab mice that was also altered like Pinky and the Brain. Brain romantically pursues her, despite the fact that she's just as dumb as Pinky. She was also more interested in Pinky than the Brain. Despite Billie having great intelligence, she can act a bit ditzy at times. Billie first appeared on Animaniacs in the short "The World Can Wait"

Appearances
Season 03, Episode 03 "Brain Noir"

Season 03, Episode 30 "You'll Never Eat Food Pellets in This Town, Again!"

Trivia

 * In You'll Never Eat Food Pellets in This Town, Again! Brain is married to Billie, but her real name is Shelly and that she complains not being in more of the show.
 * Also she said that Billie only appeared in 3 episodes but she only appeared in 2.
 * Billie's real name is Shelly.