I'm just gonna drop off this awesome observation from the other thread with pretty much rules out Blackfire.
Wallow Blacklake wrote:First, in the third panel, we see the difference in hair coloring between Mimi and her "mother."
From this, we can determine that the person holding Mimi has slightly lighter hair then hers, which is black. Assuming that in this alternate universe, everyone has their original hair color, this would mean that the person holding Mimi is not Olga/Buttercup/Blackfire (black hair) or DeeDee/Bubbles/Charmcaster (blonde hair / is too light). So that leaves us with Blossom, Betty, Starfire and Gaz (assuming she has the shade of Hair color as seen in the Zim comics). Tell me if I missed anyone.
Okay, so I was wrong on my Charmcaster guess, too.
Um, if that's Betty from Atomic Betty, she's dead.
And I'm pretty sure Gaz can't fly.
So that basically leaves Blossom or Gwen.
Unless, like I said, there's a character I haven't even taken into consideration...?