Sirena Von Boo, the new Monster High ghoul, is part mermaid, part ghost, and part of the new Monster High DVD Freaky Fusion. Sirena Von Boo is sometimes described as an "air fin" because she loves to daydream and follow her imagination. Sirena Von Boo has a go with the flow attitude, and does not like to be pinned down. Sirena Von Boo loves hunting for treasure in the sea and frequenting antique shops on land. This curiosity about the unknown has translated into a love of archaeology. Exclusive Games