Marina

Marina is one of the beautiful-but-deadly Mermaids of Whitecap Bay, featured in Pirates of the Caribbean: On Stranger Tides. In the final version of the film, she did little to distinguish herself from the other mermaids who attacked the longboat therein.

However, a deleted scene strongly suggests both that she knew Jack Sparrow before the encounter and that she has mixed-but-fairly-intense feelings for him.