Bert, though intelligent, is also grumpy, boring and easily frustrated. He enjoys activities such as paper clip and bottle cap collecting, cooking oatmeal and watching pigeons. In one sketch, Bert reads a book called "Boring Stories" and chuckles, "Boy, these Boring Stories are really exciting!"
Bert has a twin brother, Bart; a nephew, Brad; and an Aunt Matilda. Brad (presumed to be played by Richard Hunt) had a voice like Beaker, but slightly deeper, and while he still made baby-like noises, he was able to talk. Ernie brought a toy shark with him in one skit; Brad was scared by it, not realizing it was a toy. Bart looks exactly like Bert—Ernie once mistook Bart for Bert—but Bart wears a suit and fedora and is a salesman ("Bart's the name and selling's my game!"). Bart also tells several jokes, and laughs at his own jokes and has combed hair. Bert's Aunt Matilda is never shown, but is often talked about, usually concerning Bert buying presents for her for numerous reasons.
In your opinion, does he look like a banana?