Mr. Ogrethor is a custodian at Monster High. He has a gruff demeanor, but is a helpful man just as long as people don't make noise. He has sensitive ears and loud sounds greatly hurt him.
Because Mr. Ogrethor has very sensitive ears, he gets irritable when ever someone plays loud music.
Ogres are imaginary beings which are usually depicted as large, hideous, humanoid monsters. They are frequently featured in mythology, folklore, and other works of fiction. Ogres are most often described in fairy tales and folklore as feeding on human beings. Orges have been featured in many classic fairy tales as well, such as Puss & Boots.
In "I Know What You Did Last Fright", Frankie and Jackson asked Ogrethor if he had seen Holt the other night. He answered that he had indeed seen him, carrying a few buckets of paint. What he forgot to mention was that Holt was listening to music at the time, which he ended up turning off because it hurt his ears.