Levi is NOT Mikasa’s brother and they are NOT siblings. However, Levi’s mom was an Ackerman, which means Levi is also an Ackerman. Levi and Mikasa both come from the Ackerman family and have the same bloodline so it’s possible that they may be cousins.

History of the Ackermans

The Ackermans were originally a noble family of warriors that served and protected the Reiss royal family. However, the Ackermans turned their back on the royal family when they discovered that the first King and all of his descendants refused to help humanity against the Titans.

The Reiss royal family grew fearful of the Ackermans since they could not be controlled. This is because they could not alter the Ackerman’s memories like other humans since they are from a noble bloodline. As a result, the Ackermans were persecuted.

The Ackerman family had a main branch that lived on the surface. However, they were poor and persecuted. There were other members of the Ackerman family that were still underground. Ackermans that were underground lived in even harsher conditions.

Kenny Ackerman and his sister are members of the Ackerman family that had to live underground. Kenny’s sister grew up in harsh conditions and would later give birth to Levi.

Why is Levi and Mikasa So Strong?

Levi and Mikasa are strong because they are Ackermans and have warrior blood. Ackermans become “awake” and feel a sudden power surge through them when they or a love one is in grave danger. For example, Mikasa felt a power awaken within her when her and Eren’s life were threatened by thieves.

Both Levi and Kenny have claimed to have similar moments.