This is my other OC, Ironblade, who is an evil version of Ironhide whose works at the Rainbow Factory, the PMV song, not the fanfic. This is her Cutie mark http://i.imgur.com/K1b6gSr.jpg

She works and lives in the Rainbow Factory, and is the one in charge of said factory. While others do most of the work, she enjoys to help with the killing. She kills them differently from the others; she has the victims in a room made of thick one-way mirrors with a wired floor, so that when she butchers them with four oversize cleavers. Also her right eye (your right) is robotic and allows to process what is happening faster.

She was an orphan with only one friend. She was adopted by a nice, kind unicorn that was the head of the Rainbow Factory. She then raise Ironblade to take over for when she (the head of the RF) dies. As you can guess, she does after a while and, as tradition, is replaced with her pupil, in this case Ironblade.