Here's another idea, based on something I saw online: Basically Twilight married Lightblade and had Aurora, the dragon girl you see. The Elements of Harmony are still the same, and Lightblade and Twilight form the "Equestrian Alliance" kind of like the Republic from Star Wars or Federation from Star Trek. A unification of many races and species in Equestria in order to bring about peace.

And, from what I can tell, fat is a standard there.

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