McBoo's Mansion is a world in Fantendo Hearts. The world is a combination of the McBoo Series and YoshiEgg Series.
- Gengar - fought outside of McBoo's Mansion. He tricks McBoo into attacking Sandslash and his friends.
- McBoo - the level's boss, Gengar tricked him into believing that Sandslash is trying to take over the mansion.
- The Groo - An optional boss on any return visits to McBoo's Mansion. He is destroying YoshiEgg Nook's store. He gives you the Ink Charm when you defeat him.