Mari would also be considered an AU - all of the Rebuild characters are, as Rebuild is considered a "canon AU" due to its relationship to the Evangelion series. Her tag will have the same AU number as the other Rebuild characters to indicate that they're from the same universe. (The Rebuild characters will likely have the [AU1] tag, whereas non-Rebuild AU characters will have tags such as [AU2], [AU3], and so on.)