OH sorry, I forgot to mention that! m(-_-)m

Marcus's "growth bonus" gets directly carried over to Eiko. So, the more "growth bonus" you have with Marcus, the stronger Eiko becomes. But before you start leveling up Marcus (if you want to join me in doing this) is to kill off Steiner and Dagger because if they level up with Marcus, then you obviously can't get a lot of "growth bonus" for the two.