Fin,
Gwath and
LMP - thanks for your comments, they helped me. I was thinking about along the same lines as you and it was good to hear my idea of it wasn't totally weird.
Valier (and all you others as well

) - I think one more wirter would be no problem, but the introduction of the character sounds slightly complicated, especially if there are already two characters that are to be introduced later on. But I'd very much like to give this mysterious newcomer a chance to join our little party. I think the final decision is yours,
Valier (and
LMP's) as you know what is to happen in the RPG: we ordinary players really can't have a strong idea of whether there will be situation(s) in which a third "late character" could be taken along or not.