Shadow Hearts/Nightmare Fuel


 * The Doll House sidequests, particularly the one in the first SH. Also, the Boss Room in the optional dungeon Kowloon Fortress is just... *shudder*
 * More to the point: you know how most RPG series use kind of goofy-looking cutesy monsters as enemies? This one uses skinned corpses. For Mooks. And they're the least disturbing thing about it!
 * The enemy bios in the Library are quite unnvering. There's a particular enemy in Covenant that's described as devouring a pregnant woman and absorbing her into itself and the person trapped inside is screaming constantly.
 * Near all the monsters in Koudelka and the original Shadow Hearts are just... fucked up. Case in point: One of the first monsters you encounter in Shadow Hearts is a giant spider that- according to its bio- injects corrosive venom into the anus of its prey, and then devours its melting insides. One of the first monsters.
 * More examples include the Armdog, an upside-down dog standing on a human arm... "The ghost of a postman who ate all the dogs in town." Or Sin, a scrawny naked woman standing on her arms, holding a pike with her toes which goes through a brain - "a mistake of God which seeks revenge against its creator." Or Guinea Pig, again a naked woman - with no head, that attacks you by splitting its whole body between her legs to bite you. Or the snail-girls in Zhaoyang village, with an absolutely horrible scream - "the ghost of a girl who was burned alive. She is very lonely, but don't get to friendly with her." For Covenant, we get male Fan Disservice in the form of a masculine lower body, gliding on its abdomen and legs in the air, which hits you with a huge phallic lump of flesh hanging from its crotch and bites you with mouths in the crook of its knees. And that's not even going into the bosses...
 * Li Li of Dalian is bound to give a few players a nasty shock due to her grotesque appearance on her Character Portrait.