Levi is gay

This is because Isayama, the Japanese manga artist who wrote and illustrated the series, confirmed that Levi was not gay. He also implied that Levi was not bothered by women, so he’s not bisexual either.

In the Attack on Titan anime, Levi and Erwin have a relationship built on loyalty and respect, but it wasn't always this way between the two of them. When Erwin first caught Levi and his friends stealing and forced them to join the Scouts, Levi was less than thrilled with the arrangement.