Trolls

Although this term can refer to a mythical creature...like the troll under the bridge...a troll can also be someone who tries to offend and upset people and/or get them into arguments with one another. Motives can vary from hatred for others to laughing at responses to enjoying causing suffering with the ones involved. Q, Bender and Marceline do this to laugh at people responses and to amuse them

Discord, Hades (Kid Icarus), The Joker, Roose Bolton, Ramsay Bolton and Sirash do this because they enjoys causing suffering with the people they do it to.