Hehe, I've been reading Ma3 for over a year and a half now and its a frakkin riot! Amber-Amber (the young lady who buried her face in Dee-Dee's bazooms) is a relatively new addition to the cast. She's a former porn actress.
The character isn't new, Gary has a poster of her in his room, and Zi was shown in one flashback as the one that introduced Amber to orgasm, with Amber ejaculating the epic quote, "There has GOT to be a way to make a living doing THIS!"
She is new in terms of being an active participant, and I don't even want to imagine what Gary is going to do if/when he finally "bumps into Amber-Amber" in person.
I thought Zi's role-playing a nerdy highschool student on her date to the play with DeeDee was a wonderful twist. The author/artist has another comic strip, "Errie Cuties", which is a comic romp as well but rated G with suggestiveness rather than the rather explicit R of Ma3.
http://www.eeriecuties.com/