Gallian Beast

'''This is not FF7 canon. Well, some of it is. Most of it is not. This is mostly me trying to keep my notes straight. Spoilers abound.'''

A sentient canine similar to the Firecats (Nanaki) of Cosmo Canyon, they are all but extinct. Unlike their larger cousins the King Behemoth, Gallian Beasts are capable of understanding- and to a lesser degree speaking- human speech. Their forelegs have hand-like paws with opposable thumbs. It is also rumored that they know how to use magic.

Gallian arrived in Vincent's headspace after a tissue transfer. Vincent had only recently survived a case of Geostigma which is usually fatal. Because of the Chaos materia in his chest, he was able to recover. However, his liver needed to be replaced. Curious, Hojo replaced the ruined organ with animal tissue and blood. Remarkably, Vincent's body accepted the foreign tissue, but with a very notable side-effect: when his limit break triggered, he transformed into a Gallian Beast.

Gallian has a separate and distinct personality from Vincent and the other limit breaks who share Vincent's body and mind. Gallian is not Vincent, and Vincent is not Gallian. Although Gallian will answer to Vincent's name, he tries to remind people that he is, in fact, his own creature.