Yeah, with CHA 8, he would not be able to cast any spells at all if you dualed him over to rogue. So that would certainly be a waste.
If you take him to any other class, it will be a long haul until he reaches 7th in the second class because of the xp penalty.
Monk would not be a great choice because of his low wisdom; no AC bonus there, and monks need all the armor bonus they can manage, especially early on. Cleric is similarly out because wisdom is low, ditto for wizard and int.
SO if you want second class, you're pretty much stuck with a tank type.
On the other hand, I've had groups with pure rogues all the way through, and found them to be effective with bows and rapid shot. As an elf, he can use the longbow, and there are some nice bows/arrows in the game. Also, his strength is good, so he ought to get some decent backstab damage in, as well.
Nightowl2
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