Making Usopp's entire intro/character arc about Zoro and Luffy. Usopp was not even given a passing chance to show his bravery and introduce him as the coward who steps up when it counts, he just lurked in the background the whole time. As my partner said, Usopp wasn't even the star of his own goddamn backstory.

I was like ah, I see, character traits and development be damned. I'm out.