I'm glad that they didn't make Bing Bong...[SPOILERS]
...a villain. I mean, Bing Bong could've easily been the "surprise villain" who betrays Joy and Sadness in the climax of the movie, but I'm glad they didn't take that route with this character. I've got nothing against Pixar or their villains, but they've been using the surprise villain trope for way too long, it's kind of getting cliché anyway.
[Formerly CosmosX9]