Syrena is a character from Pirates of the Caribbean: On Stranger Tides. She is a beautiful, enigmatic mermaid who swims against the tide of her more lethally-minded sisters of the sea. She also serves as one of the two deuteragonists (alongside Philip Swift) throughout the film.
Add actors/actresses and cast the roles/films/series that they were rumored, considered, offered, negotiated, auditioned, turned down, and/or originally casted before getting recasted. (Please double-check in research.)