Fusion Fighters United Army

The Xros Heart United Army is the allied army of Xros Heart and Blue Flare.

In the anime, it was born after Mikey Kudō, the Xros Heart General, returned from the Human World. During the ensuing campaign against, he finally joined forces with Kiriha Aonuma's Blue Flare army.

In the manga, the united army was created after Xros Heart and Blue Flare worked together to defeat at Odaiba in the Human World.