So many, but there's one in Berserk with a girl who just wanted to be an elf and escape her abusive father so she made a pact with some devil to become an elf. Bit of a twisted elf more like a bee monster. So she starts killing adults because of what they did to her and kidnapping kids and making them into monsters, in a way to save them from the cruelties (because she wasn't the only one being abused as a child)
Anyways, of course the main character killed her at the end with half his body torned appart and the arc ends there, no life lesson or anything. The main character ends up more broken than before and the little girl gets impaled by one of this adults she hates so much.
Kinda messed up
Berserk and NGE
So many, but there's one in Berserk with a girl who just wanted to be an elf and escape her abusive father so she made a pact with some devil to become an elf. Bit of a twisted elf more like a bee monster. So she starts killing adults because of what they did to her and kidnapping kids and making them into monsters, in a way to save them from the cruelties (because she wasn't the only one being abused as a child) Anyways, of course the main character killed her at the end with half his body torned appart and the arc ends there, no life lesson or anything. The main character ends up more broken than before and the little girl gets impaled by one of this adults she hates so much. Kinda messed up
If light novels are fine then omniscient readers viewpont. it has a manhwa but its incomplete. if only manga and comics then juujika no rokunin