Deimos

Male Changeling from an MLP AU where the changling reformation never happens. Currently lives in Ponyville disguised as Duskbeats, dating Amethyst.

Basic story:  One of a group of spies sent to infiltrate pony settlements and send love back to the hive. Deimos was sent to Ponyville, and found Duskbeats on a walk by the outskirts of town. Deimos used changling magic to steal his memories, killing Dusk in the process, and took on his form.