Topic on Category talk:Esoteric Trope Names
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Taking the second one first: "Cerebus Syndrome" was identified at least as far back at 2004 in this Stanford University work. It may be esoteric, but it's a real-world term, so I for one think it doesn't need to be changed. And if we do change it, we should keep "Cerebus Syndrome" as a redirect.
As for "Disney Death"... yeah, that's non-indicative and misleading. If anybody has a suggestion for a better name, feel free to offer it.