A Station Eight Fan Web Site
I want to repost this question like you suggested:
I'm interested in your thoughts (and possibly Brandon Vietti's and Jamie Thomason's as well, if possible) on the casting process for the voices of the main characters of Young Justice. What was/is it that the main cast - Jesse McCartney, Khary Payton, Nolan North, Stephanie Lemelin, Danica McKeller, and Jason Spisak - bring to their respective characters that you, Vietti, and Thomason were looking for? In another question, you answered that the members of Young Justice were chosen based on a variety of factors (i.e. personality, dynamics, etc.). How did that play out in the casting process?
GargWiki.net has answers for all your Gargoyles questions.
Includes episode commentaries by co-creator Greg Weisman, interviews with the cast, and a documentary on the fan convention.