Diablo is Maleficent's pet Raven featured in Aurora and Dawn.
Background[]
Sleeping Beauty[]
The raven would often act as Maleficent's assisstant more than a pet, but still it appeared to be the only thing she cared for. He also learns that Dawn, the princess and long-lost daughter of Stefan and Leah, is Maleficent's undoing, as she has the gift of the light-hearted. He is later turned to stone by Merryweather, much to Maleficent's shock and grief and anger.