Korgan Why doesn't anyone keep him? I've read a lot of post and he doesn't seem to be in anyones party. And should I really trade aerie for edwin?

Take a look at the alignments post, everyone here's (chaotic) good, so for some reason nobody likes evil characters. Korgan's easily the best fighter in the game; I always put him in my party. And Edwin is about ten times the mage Aerie is.

finally some sense on this board... Korgan is by far the best fighter and Edwin is the only decent mage. likewise with Viconia... seems like the evil party is the way to go.

Why does everyone feel constrained to either have a 'good' or 'evil' party? You can be good and still take Korgan, Viconia and Edwin, the dialogue is much more interesting as they argue all the time. If your rep is too high just lower it by stealing something.

Korgan is the best fighter in the game.

Yep, the dialog is definately interesting. I have Edwin and he had one with Aeri that cracked me up.
Aerie "Edwin"?
Edwin "OH, hello Aerie, how are you child"?
Aerie "Who are you talking to"?
Edwin "What? (I'm not talking to anyone) I'm not talking to anyone. Why do you ask"?
Aerie "I was just wondering when I could talk to him".
Edwin "Go away, leave me alone, I won't share seconds with anyone"!