Whirring Cogs the changeling pegasus. Cogs is pretty much my main alter-ego in the MLP universe. I hadn't planned it that way, but he kind of took over from my original pony character.

Convention art from Ponycon AU 2014 in Marebourne... I mean Melbourne, Australia! I forgot to ask the artist how she wanted to be credited, so I won't use her real name, but she went by MinArt at the dealer table.