I will add that Terri & Terry are my favorite sidekicks from Monsters University.
I’d put Mater as my favorite sidekick from Cars because, let’s face it: He sure is funny.
I like Mater also. I think a lot of people dislike him, or like him ironically. He is dimwitted, but he’s such a sweet and important character.
Does anyone find it weird if I also say Pez Cat from Toy Story of Terror? 
Sorry to double-post, but I’m starting to crave Bing Bong from Inside Out… 
I already read the books!
Inside Out certainly added a lot of sidekicks to choose from! I like Bing Bong as well.
If Bing Bong counts, he’s among my favorites.
Of course he counts!
Here’s an article about how he’s a “sidekick done right” rotoscopers.com/2015/06/22/s … one-right/
If I had to pick a favorite from The Good Dinosaur, it would most likely be Forrest Woodbush. Don’t ask me why I picked this guy…'cause while he only makes a short appearance in the movie, I still find him attractive.
As for the rest of the films, however, since I haven’t quite got to that yet (and I probably won’t include the titles they’re from, since a lot of us already seem to know):
Slinky
Heimlich
Mr. Potato Head
Roz
Gill
Frozone
Doc Hudson
Emile
M-O
Kevin
Pricklepants
Holley Shiftwell
the triplets as bear cubs
Scott “Squishy” Squibbles
Bing Bong
So…there you have it.**
–evspixarfan2012