Queen Chrysalis

The queen of the Changelings that attempted to take over Equestria with the motive of gathering food in the form of love for her subjects.

Nightmare Moon, Queen Chrysalis, and other major villains in My Little Pony: FiM are based off of the Seven Deadly Sins.

Some Changelings don't accept Queen Chrysalis as their queen and live as Ponies in Equestria.

Queen Chrysalis wanted to immitate Princess Cadence because Princess Cadence was going to rule over the Crystal Empire, which is powered by love, and would therefore be a large resource of food for her and her subjects.

Queen Chrysalis was once Clover the Clever who had the love drained from her by a then weak Crystal Heart to try to kill all the Windigos.

The princess that consumed the Love Poison mentioned in "Hearts and Hooves Day" was Queen Chrysalis.