Cheat Suikoden 2 : Play as McDohl

First, you must have save data from Suikoden loaded into the Suikoden 2 file. Then, after you beat Luca Blight, go to Banner Village. Talk to the hero lookalike, and he will tell you McDohl is here. Go east of the inn to see Gremio or Ellie blocking the way. Go talk to the lookalike again, and he will divert attention. Talk to McDohl, and Gremio/Ellie will eventually
tell you Ko, the lookalike, is gone. You, McDohl, and Gremio/Ellie go off to find Ko in the path to Gregminster. At the end, you will be face to face with Lepant, who offers McDohl the presidency. He and Gremio eventually go to their house in Gregminster, where he can be recruited at any future time.