|“||Thank you Goku. Your anger feels simply incredible.||„|
|~ Goku Black getting stronger from the pain dealt to him by Goku|
|“||Come on, baby! Beat me 'till your knuckles bleed! And why quit there? You know there's only one way to stop me!||„|
|~ The Joker as Batman brutally beats him.|
Sadomasochists thrive off of pain, whether it be the pain of others or pain inflicted on themselves. This is most common in villains who are sex fiends, Perverts who endanger others for the thrill, self-loathing/Suicidal Villains who use pain as a coping mechanism, or maybe two or more villains who feed off each others' pain and keep the circumstances going out of mutual need.
Please note that Sadomasochists differ from Sadists, who only get pleasure from pain inflicted on other people. Sadomasochists don't just enjoy pain; they get a fix out of it and need it as opposed to wanting it. They also differ from Masochists, who only get pleasure from receiving pain, but don't strive to find it; they merely enjoy it when it comes to them.
This can also apply to some villains that require pain to sustain themselves; they need to "feed" off of pain in a predatory fashion in order to exist/thrive (ex. KeyFace, Zalgo, etc.). This does not mean that they still cannot enjoy it, though.