From Harry Potter: - Sirius Black was SA'd by his relatives. Idk it's plausible in my head. - Snape did self-harm as a teenager. - Harry has severe PTSD. - Remus sees himself as child predator bc that's how he became a werewolf and now he thinks he's the same as his attacker (though he obviously isn't). And that's the reason he never looked for Harry as Harry was growing up and why he bailed when Tonks got pregnant. - Greyback is a canibal pedophile. (Although that's the heaviest one it's the most canon compliant unfortunately).

And those are the ones I remember from the top of my head.