After watching the walkthroughs of Prime game one day, the idea came up to create vehicon OC - a tank and a sniper that work together.
The tank was named Tarc (a nickname that was created from his serial number). The helicopter's name is Ledo.
The bottom line is that these are the last surviving vehicons of the species, who traveled to Earth on a Decepticon escape pod.
All in all, it's a pretty typical duo of a calm big guy and an impulsive little guy, who nevertheless give each other the support they need after surviving the horror of the war on Cybertron. I suppose that helicopters were originally made with not the strongest psyche in order to keep them close to the tanks - their main defenders. Tarc and Ledo have moved much further away from their original programs, i.e. mentally they are more evolved, but that also means they are more unstable. So, for Megatron specifically, they're a problematic pair. But the leader is willing to overlook their shortcomings, as these guys are still an strong unit.
And despite Ledo being a psychologically strong sniper (when compared to other vehicon-helicopters), he still gets broken from time to time. Hell hasn't gone away for both of them. But in the years they've spent together, Tarc has learned to express empathy (tanks are created quite indifferent and poor on emotions )
After everyone left Cybertron, the two survived by using spare parts from their dead comrades. There's already a headcanon here that the choppers could give first aid to their tanks if they got too badly damaged during the hostilities. They didn't replace medics, of course, but it increased their chance of survival, which was key for this pair. Of the most noticeable details, the Tarc had the left half of the "wall" replaced with a new one. The sniper, on the other hand, had part of his leg taken from one elite siker (their distinguishing features may change though)
I don't know if there will be minicomics with them, but just like these guys. Despite the fact that there are almost no references with their anatomy and everything is drawn almost at random x)