anyone can be a mermaid, or merman. it's surprising and shocking, really. you can overlook a girl at school and think "huh. that looks like a nice girl" and walk away, but that girl can possibly be a mermaid! in order to try to figure out this, think to yourself "did i ever see this girl in water?" if no, you should try "accidentally" spill water on her. this is because most mermaids (or mermen) pop their tails when they touch water. its that most common. you may look at your parents differently now . . . they may be some mythical creature. it's almost unlikely, though. some parents don't believe in mythical creatures. :-(.