And here is a simple straight-on shot so you can see Chromia and Ariel unobscured.
In the G1 episode "Fight or Flee," it was revealed that the planet Paradron was an energon-rich forgotten Autobot colony hidden from the universe at large by a kind of "space vortex" (G1, folks!) and populated by pacifistic war deserters...so, naturally, Rodimus Prime blew the fuck out of it, declaring Cybertron better because it wasn't "so...perfect."
What a dick.
I suppose, in a way, Ariel qualifies as an OC since the Paradron Medics were nameless drones in that episode. Her name comes from the Japanese name for Energon Arcee, which was also originally G1 Elita-1's original name (like how Optimus Prime was originally Orion Pax); the idea to call her that comes from the "Ariel Paradron-Type" recolor of Energon Arcee Takara released back in '06, which was the first transformable homage to the Medics ever made (although there were previously a few green redecos of non-transformable Arcee merchandise as well).
The pacifist-thing is also why she was holding a robo-teddy in the group shot; the Medics' "guns" were originally dubbed "energon infusers" in the "Heroes of Cybertron" line, but since I didn't have any pistols other than Rally's that would fit her hands (and since I thought "healing pistol" was stupid), I gave her MacGuffers instead. So sue me.