User blog comment:DCFreak22/Mount Justice Authorized Guest Designations?/@comment-4473295-20120126213101/@comment-64.247.101.204-20120126231055

Catherine Colbert is a possibility, because she was supposed to be voiced by Stephanie Lemelin who is Artemis' voice actress. I see Rocket as another possibility since she has had 2 cameos thus far and hasn't been named on screen.