Looking at the comics sections, the examples of Alternate Company Equivalent
and Captain Ersatz
aren't a complete match, but there are definitely some shared examples between them and both seem to be used as "a character deliberately created to stand in for another".
There seems to be a sense that Captain Ersatz
is a subtrope of ACE, but if that's the case they shouldn't be on ACE, especially as they may be obscuring what the trope actually is. I was looking for the trope/YMMV/trivia that describes such pairs as "Aquaman/Namor" and "Dr. Strange/Dr. Fate", and my impression is that ACE comes closest, but I'm not sure if Aquaman/Namor, the most obvious example, has ever been on that page except indirectly, so maybe not. I don't think it helps that on This Index Is Copypasted
, both are listed as subtropes of Expy
, which might actually be narrower than either one.