Attack on Titan no Shifters
In This There are no such things as Titan Shifters. But sometimes When injected with the Titan serum some gain intelligence, But the ones that gain intelligence still Kill and eat humans they are just smarter.
That is until a Teenager watches as his whole family is Fed to titans and then gets Injected with the Serum, But he keeps his intelligence and Never attacks a human, He only attacks and kills other titans. (you can change eren's backstory but please No Shifters)
There is a Urban legend in The survey Corps Of A Kind and Helpful Titan.
The legend has been around Since the survey corps first Mission.
After Massacre That left one survivor, A woman Who Told a Story of a Titan that didn't eat humans, and had saved her from being eaten by taking her to the wall.
She Was Believed to had gone Crazy From the trauma of being the sole survivor.
Years go by And her story has turned into an urban legend people thinking it was propaganda to get more People to join the scouts.
But secretly This Helpful titan has saved more scouts, But the scouts he saved Knew of the woman who became an outcast After the public considered her Crazy, And not wanting to join her as outcasts they never said anything just retired or quit the scouts.
No one other than The people the titan saved know of its existence( They all think they are the only ones who know not knowing that multiple people know about the titan)
That is until Hange While on a expedition Discovered a Notebook, That a scout had being writing in, Telling the story of a titan That didn't attack and spoke but Became enraged after She questioned it and went to kill her, But before it could a 15 Meter titan Came out of nowhere Killed the titan And Put her in a cave Guarding the entrance. And that was the last thing written. ( as the writer forgot her notebook when The titan took her close to the wall)