Britta and Troy are definitely the most improved from the early parts of the show. They completely changed their characters by season 2 in the best way.
Yeah, it's crazy. I re-watched some S1 eps today and Troy is completely different now. I think he's been kind of...Abed-ified over time. Which not only makes perfect sense, it makes him more entertaining too.
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XIII_rocks, the cream of XIII fanboyism.