Attack on Titan. Oc x Jean- Better Together

Karasu Ackerman-the one and only mikasa Ackerman's younger sister.
Mikasa was always a quick learner she was walking at a month old and when her dear sister was born, she eagerly peered over the silky white cocoon that protected her dear sister from the outside pain. From the moment their eyes meet, Kara's piercing blue eyes and mikasa's calm black eyes, they knew it was them against the world...
~~=:<+>:=~~
Karasu always saw the world as an adventure, a naivete she'd never shake. She always fought the demons in her, trying to stay her kind hearted self. However when the battle gets too much, the person she finds the most unlikely to, brings her back to reality.

She makes him brave, and he keeps her in reality.