I’m really apprehensive about what her inclusion likely means for the series, especially right at the beginning of its run.
The movie and the special really shined from their plotlines not being driven by any malicious actors, and introducing an ~evil alicorn lady~ to drive conflict from the shadows really doesn’t play to G5’s strengths so far.
As DarkObsidian pointed out earlier, there is a theory floating around youtube that Shadowy may be none other than Radiant Hope. If that turns out to be true, that would really turn all that talk of the comics not being canon on its head.
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