Yeah, the author really love monsters. Wahahaha! :3
I wonder, where did he get those info and ideas? LOL!
If Tsukune is the only one who can took Moka's rosary off in order for her to become a vampire; then vice versa, Moka is the only one (maybe) that can put again the rosary to Tsukune in order to become a human again. LOL!
SO THAT'S IT! It would be more okei if Rosario+Vampire=Ghoul.