Attack on Titan's creator Hajime Isayama once revealed that he never wanted to make Eren, Mikasa, and Armin's characters the center of the story.

Mikasa and Levi are two of the strongest soldiers in Attack on Titan, and it's largely because they're Ackermans.

Hajime Isayama created a tragic love story between Mikasa and Eren because Attack on Titan could not have relied on romance.