Elastigirl is not "Mrs. Incredible" and it forever drives me crazy when people say that. I think it's fine as an acceptable answer, but never once is she referred to as Mrs. Incredible, only Elastigirl
You can put at least some of the blame for that on Disney, because a lot of the merchandise had her labeled as "Mrs. Incredible." As I understand it, this was because DC Comics already had its own Elasti-Girl, and thus a merchandising trademark on the name (and the essentially identical name "Elastigirl" that Pixar used.)
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