Sirena Von Boo is a character in Monster High. She is a mermaid-ghost hybrid. Oh no! This Halloween article has serious gaps or missing content for the topic. Did the monsters take it? How scary! Can you help fix it? You go that way, and I'll go this way... Retrieved from "https://halloween.fandom.com/wiki/Sirena_Von_Boo?oldid=20695" Categories: Article stubs Characters Ghosts Community content is available under CC-BY-SA unless otherwise noted.