What is eren x levi?

Eren x Levi is a popular ship in the Attack on Titan fandom, also known as Ereri. Eren Jaeger is the main protagonist who possesses the power to transform into a Titan, while Levi Ackerman is a skilled soldier and captain of the Survey Corps. The ship is popular due to their conflicting personalities and the potential for a compelling dynamic, as well as the chemistry and tension between them in the show. However, it should be noted that this ship is not canon and is purely based on fan speculation and interpretation.