Reader who can shift to a titan: its mostly used but, hear me out
The reader cant shift just like the others- because they lose their sense of humanity.(eats people, etc.) They were warned about it from the start because of their mother being the first shifter to act diffrently... which in the end their mother gets killed
Also when they shift into a titan their body goes into a state of hibernation- the same reason of their mothers situation... blah blah, they shift into a titan because of a risky situation and yknow... months later they end up in a forest (during this period: 2 days after eren was found to be a shifter...) titan form gets their nape cut off by a titan slayer and they find the reader hibernating...
Idk i cant think anymore