WxrtHltl-jwlpklz (which I have to copy and paste every time because it's a nightmare) is a demon and appears in Wyrd Sisters. Nanny Ogg accused him of being behind the door when the vowels were handed out.
When he manifested he was kind of handsome, but, being a demon, he was 'a little cruel around the eyes and beaky about the nose'. He also declared his name unpronounceable by human tongues, however, Granny Weatherwax soon proved him completely wrong about that.
He is the one who reveals to the witches that the kingdom itself is unhappy because it is being ruled by a man who hates it after being threatened with boiling. Once he has revealed his knowledge he is banished with the wonderful words:
"Oh yes, run along."He is not overly pleased.
Sources: Discworld and Terry Pratchett Wiki | Roosterteeth | TVTropes
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