Beast first made his appearance in Kingdom Hearts and has a important role. He first helped Sora by foiling Maleficent's plot. In Chain of Memories, his role is minor, serving as a memory of Sora. In Kingdom Hearts II, he welcomed Sora, Donald, and Goofy with hate and rage, while locking his servants in the dungeon. The one responsible for this is Xaldin. After Xaldin was defeated, he kidnapped Belle and pitted them against Nobodies and the Dark Thorn. Later, after dancing with Belle privately, Xaldin takes the Beast's rose Beast in rage asks Belle to leave the castle. Not long after, Xaldin kidnapped Belle along with the rose. Outside, he fought with Xaldin with Sora. After Sora wins, the Beast rescues Belle and the rose.

In the fights, Beast use his hulking strength with animal features and no weapons to defense himself. Stunning the enemies with some earthquakes to the ground is a good strategy when sorrounded.