Concept: Sabino

A Catholic knight-errant and son of the enigmatic Cosimo, Sabino meets Vince by chance and is fascinated by this stranger's combat ability; in between dealing with the "demons", he tails Vince and tries goading him into a fight. Naturally, Vince isn't too fond of him at first, but gradually warms up to him after Sabino gets the fight he wants (read: gets his ass soundly handed to him).

Meta-wise, this character was born out of a mental exercise to expand Tempus Irae's story without disrupting things too much (though what I have in mind for the last act might result in some serious divergence).