Changelings



"These Changeling guys seem that they were once evil, malevolent sapient creatures in Equestria that tried to attack the royal wedding that's about to happen in Canterlot, which is all about Prince Shining Armor of Equestria's 'bout to get married to Princess Mi Amore Cadenza, or Cadance for sure, of the Crystal Empire... before Flurry Heart was there. Nowadays, they're metamorphosed into good, better, love-filled, diversely colorful guys. Well, mostly. Some didn't."

--Su Ji-Hoon, The Truth About the Terrorist Attacks

Changelings are a race of creatures in Equestria that first appear in A Canterlot Wedding - Part 2 as the secondary antagonists and the minions of Queen Chrysalis. They also appear in several other episodes and IDW comics.

In When the Cold Breeze Blows Away, it would be happened when they join either Thorax or Queen Chrysalis.

Also,they would be first appeared in during the USRAC War since they would have their choice to be good or evil.