Sadomasochists

Sadomasochistic Antagonists enjoy inflicting pain on others and themselves. This is most common in Antagonists who are sex fiends, Antagonists who beg for the heroes to defeat them for the thrill, self-loathing/nihilistic/suicidal Antagonists who use pain as a coping mechanism, or maybe two or more Antagonists who feed off each others' pain and keep the circumstances going out of mutual need. It isn't exactly a mental illness, as even innocent people can do BDSM, the consensual sexual act where they "pretend to hurt each other for fun." This category will include Antagonists like those as well as utterly brutal rapists who will do unimaginable things to their victims AND themselves. If the Antagonist has just a kink over enjoying their own pain in general they do not qualify.

Likewise if a Antagonist only reluctantly inflicts normal recoil pain on themselves out of anger, especially if they intend and/or had in mind to project it on others, they don’t count. Especially for the latter case, they would be exclusively sadistic.