I'm going with Roshea, though Vyland came close. Roshea joins in Chapter 5 at level 3 but with level 1 base stats. His Strength growth is poor, and his Defense and Speed growths are non-existent. His high HP growth means nothing if he can't take the hits. If you're playing the original first and third games, then Roshea is hardly worth using. If you're playing the remakes, you're better off re-classing another character to Cavalier instead of using him.