4. Mona Wu
Season 4 of DC’s Legends of Tomorrow is among the most disappointing seasons of the Arrowverse. While nowhere near as problematic as Arrow‘s fourth season or as frustrating as The Flash‘s seventh, it was a rare blemish for a show that was widely regarded as the Arrowverse’s most consistent at the time.
One of the biggest issues with that season was Mona Wu. She was initially a very enjoyable new aspect of the series, with her friendships with Nora Darhk, Ava Sharpe and Mick Rory among the most endearing parts of the season. But the more spotlight that she got, the more frustrating it became. Initially expected to become a love interest for the already goofy Gary Green (before she just became his good friend), she was also incredibly goofy and it just made a season that had already leaned too far into silly territory lose itself a little in the senselessness.
She was also a Kaupe (the result of being scratched by Konane) but her transformations into her alternate personality (a.k.a. Wolfie) lacked convincing CGI, which was just another disappointing element of the character for fans.
I personally liked Mona a lot, but season 4 of Legends of Tomorrow did push her a little too heavily to the detriment of the show.