Well, I'm not too fond of EQG personally [twiggy giant headed human things aren't my deal XD especially with the tween highschool musical angle, they could've done better, but could've done worse XD] I tend to use it as evidence of universe crossing potential in some cases XD
Also, only Twilight has actually 'seen' these other mutant human counter-parts, and sunset could be a fun encounter someday... That said >3> Adding a layer of mirror-verses would be a bit redundant in the scope of the RP as a whole, because if we'll be spending a lot of time outside of the world-fragment that has it XD
However, it's still a good suggestion, and the 'concept' can still be of use here, if not with the cartoony human variant XD... which I will keep to myself for the sake of surprise 'if' I ever decide to use it XD
So, I won't be using EQG in particular, but some of the characters from it 'may' be relevent in the future... also, with the mention of shadowplay... I suppose I should warn that some encounters in the RP may bring spoilers, for anyone who watches the show but might not have gone 'that' far.
We must be careful messing around with alternate universes though... else we might land in 'this' one!