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If the character was promoted heavily, I suppose that doesn't necessarily disqualify her from Ensemble Dark Horse, since maybe there were many viewers who didn't view promotional material, and her role in the story is still minor. But a lot of attention given in advertising means the marketing wasn't exactly not expecting her to be popular. In any case, it's partial context and seems better for Breakout Character, as pointed out.
YMMV.My Little Pony 2022
I previously deleted this as it was added before the one month waiting period. A separate troper added this back after said wait, but I believe this is still misuse as the character was heavily (by the standards of the work) promoted and publicized before debut, and Darkhorse only applies to minor/unexpectedly popular characters, Breakout Character covering this better.
Permission to re-remove? Would it be edit warring if removed over two separate misuses from separate tropers? Or any thoughts on if she qualifies as Darkhorse or not?