Thorax (Friendship Is Mystical Au)

Thorax grew up in the Changeling Hives under the rule of Queen Chrysalis feeding off the love of ponies, but for many moons, love was scarce, that's why Chrysalis planned to take over Cadance's wedding; so her drones would starve no more!

Or so the hive thought, because she was planning to take all the love for herself, Thorax knew this and disguised himself during the battle between the changelings and the Mane 6, slipping away into Equestria to warn the citizens, but was chased out after being discovered.

He hid out in a cave, waiting for the time when changelings would be more acceptable in Equestria, but was discovered by Fluttershy when she went to gather gems after volunteering to help out Rarity.

Flutter felt bad for Thorax and tried to convince her friends that he was good, Thorax retreated after the interaction, but when Chrysalis returned it was up to him, Flutter and Discord to save the day together.

The three went to the Changeling Hives to convince the drones to stop, and Thorax exposed the secret Chrissy had been keeping during "A Royal Alicorn Wedding" (the AU version of A Canterlot Wedding).

The drones rioted and all reformed, Thorax said his most iconic quote during it:

"Hatred is not strong, but love is, and being together makes it stronger!"

Afterwards the story spread due to the Mane 6 having come looking for Flutter and witnessing the whole thing, Fluttershy also being brave enough to speak up during it.

Thorax stayed behind to rule the hives as the new leader, and Chrissy was sent to Tartarus.

Fluttershy and Thorax later fell in love and got married in town square, Discord was their best man. 

Thorax is a determined, stoic, wise, and shy stallion all at once, but is very reliable and will have your back no matter what if he trusts you. 

Thorax is a pale turquoise reformed changeling, with a spiky horn and antlers, of which fade into a lime color, his wings are lime and fade into magenta, and have white spots on them, he has light purple eyes, he has deeper turquoise markings on his front legs and magenta on his back ones, he has three white gems on his neck.

His tail is turquoise, as is his carapice.