Question: what are the evil ghosts in harry potter?
Answer: 1 The Dementors. These robed, evil beings couldn't Avada Kedavra you, even if they wanted to.
2 Voldemort. ... 
3 Bellatrix Lestrange. ... 
4 Dolores Umbridge. ... 
5 Fenrir Greyback. ... 
6 Professor Quirrell. ... 
7 Lucius Malfoy. ... 
8 Aragog. ...