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Go to the links to see images that prove that they could play that character.
Some of the celebrities on this list don't lookalike due to their IMDb profile pictures but you can see resemblances in other pictures, you just have to look them up.
If I have missed any, could you please comment their names? - The list kinda get more accurate towards the end.
Not all of the movies listed have "real mermaids" - that is, some of these movies involve people pretending to be mermaids (plays, costume parties, etc...).
In a few of these movies you will most likely see a mermaid only once.
If you know any movies with mermaids in them that I haven't listed could you please copy and paste the IMDb url in the comments below? Thanks.