New DMC/MLP headcannon:

All the princesses are Nephilim(including Twilight, but she’s just now reaching her full power)

Twilight’s little transformation in Feeling Pinkie Keen could be a devil trigger that she can’t fully control and “Nightmare Moon” could be one for Luna since she’s show to be able to take that form at will in Luna Eclipsed.”Dark Magic” could be devil energy and we haven’t see the equivalent of angelic power yet*.

Sombra could be as well(or at least half-demon, which is more that likely considering he only used “Devil Energy” as well call it) and the cloud of darkness is his Devil Trigger form.

*Or the, the mane six are ALL Nephilim and the Elements are an angelic weapon