Best Pixar "background" characters?

I really liked the Dinosaur in toy story, but is that a background character?

In Monster’s Inc. he was.

That’s the character I was thinking of- Thunderhead! That was funny. That and Dynaguy’s story of how he came up with his nickname…and Mr. Incredible’s anecdote about the Phylange’s superyodel. All very funny.

I can’t believe I didn’t remember him when I posted earlier.

Ane…Amno…Amenonee

“Don’t sprain yourself, kid.”