A mystical man, stern and upright while at the same time dark and mysterious. His past connection with Shinra is what made him join Cloud and the others. He may seem frail at first glance, but hidden inside his body lurks a fearsome power.From official Advent Children site:
A gunman and former Turk. In the past his body was augmented by Shinra and he gained the power to transform into an ageless monster, a burden he must carry in life. Since that time, Vincent has wandered the world alone, gathering information, and seems to know a little about the events they all face.