Alternate View, a Changeling that is sick of how every other Changeling tells him to "act like what you are, a Changeling". He doesn´t care about what he is or what others say he should be. He´s so sick of the kingdom he lives in that on the specific day when Queen Chrysalis searched for volunteers to go with her to Canterlot to get food, uhm, love, he is the first to volunteer.

Though he didn´t exactly volunteer to actually fight alongside the other Changelings, he did something else. He shapeshifted into the image of a guard.
As Queen Chrysalis was defeated and she and the Changelings were all gone, not so Alternate View.
Still in the form of a part of the royal guard he stayed in Canterlot. And he has yet to be discovered.
However, being part of the royal guard was not the end of Alternate´s plan.

A short time after A Canterlot Wedding, he decides to travel a bit. And that is where he meets some ponies who show him how different things can make you feel better, apreciated, loved, cared for and useful.