Oc/Reader is female.

She is (Choose race except White )

She is Around the same age as Levi.(Levi x Reader)

She is from our world. But she has never watched or Read the manga For Attack On Titan.

She only heard about attack on titan from her younger sister who loved the manga and anime.

She Was in the army. She had died serving her country after Using her body to sheild her Unit mate from a Bomb Blast.

When she woke up she was in a Titan.(Years before plot starts)

She is 18M tall.
(You can choose different size if you want)

She panics before her Training kicked in and she started to observe and think about what is happening.

That's when she remembers some memories from when her sister would gush about an anime where people were turned into man eating Titans.

And that some people in the anime could turn into a Titan and have full control.

She descovers that is exactly what is happening here and tries to Remember more about the anime.

She knows of a Guy her sister called Clean shorty, Crazy Glasses, and Homicidel maniac.

She starts planing how she is going to survive in this universe.

She experiments with the titan she is in. And figures out she is super strong, fast and she heals with Steam, but she can't come out then transform again unless she has stamina.

Fortunately her body And muscle memory had come with her. So all she had to do was train in her titan Form.

She trains day and night in her titan form getting used to moving in it before she tracks and uses small Titans as practice fighting.

She figures out after a couple of fights where the Titans just kept healing that unless you damage the nape they will keep healing as that is the only way to kill them.

She soon becomes good at fighting in her titan form.

She takes that and figures that if the nape kills the Titans, if someone damages her nape she might be killed.

So she comes up with a way to fight while protecting her nape.

Months have passed and she is getting used to living in attack on titan.

She even goes out and hunts Titans down and kills them. The scouts never notice that the titan numbers are Down.

She uses her titan form to Cut down Trees, Hunt.

She builds a Tree house as high as she could reach in the trees.

And she uses her training to build a camoflauge cover that helps the tree house blend in.

She lives in the tree house. Since she was in the army she is used to sleeping on the ground so she just uses the wood floor to sleep on.

She builds a Leaf Pan to collect rain water.

She knows how to survive in the wilderness from her training.

She even builds traps that make noise to alert her of Titans coming near.

She builds bow and arrows. And even some spears.

She hunts any animal she can for food and uses fire to cook it.

Luckily plants from here are the same as home and she is able to make herbs.

She starts seeing scouts and watches them fight Titans.

She tries to help as much as she can, She Uses bows and arrows to distract the Titans she aims for the nape and it does enough damage to distract them or she gets close but still camoflauged and throws spears into their heads,legs,arms.

She manages to save a couple of people by giving them enough time by distracting the Titans.

One time when she was out hunting Titans she heard human screaming. She runs as fast as she can to the screaming and finds a woman being trapped by a Titan in front of a tree. (Ilse Langnar)

She hides behind a tree very close by  and watches as the Titan stops bows and then starts speaking. She is shocked as she has never come on contact about a talking titan.

She thinks maybe it has a person inside like her but then she watches as something changes in it and it goes to eat the woman.

Using every bit of speed she has she rushed in just in time to cover the woman with her hand.

So all the titan ends up buying is her hand before she kills it.

The woman in her hand starts screaming while still writing in a notebook.

Not knowing what to do she starts walking as the woman still screams and writes.

After almost taking the woman back to her tree house she changes her mind and instead  she decided to bring the woman back to the huge wall she knows hold all the humans from the memories of her sisters talking about them.

The woman after a while stops screaming but she didn't stop writing.

Just before they got to the wall the woman in her hand falls asleep.

She crouches down and sneaks to the wall. Putting the woman down before poking her hard enough to wake her but not hurt her before running away.

Hiding as she watches as the woman gets in the gates.