Front view, cockpit open:
On the right shoulder there is a energy missile (small), and on the left there is a energy-powered minigun.
Ready to know how the energy powers the suit and where it comes from? Well, first thing you will see is that the evil robot inside is exactly two colors: black and trans-blue. The trans-blue represents the energy glowing in him....it. When the robots where "upgrading" themselves, each one injected a special and uniquely formulated energy codes. These energy codes mixed with the robots' internal processors, and eventually the robots would become more smart, agile, and "bad", if you will. Notice that there are NO levers or other methods that robot is controlling the suit. That's because the LEGO City officials and the populace don't know how the systems work.
Just doing this to help the you, the reader, to keep you spot while reading this. I know, it's long:
However, we as the ones who will fight them back, we do know. The energy is stored in the robot itself. If look near the robots hands and feet, you will several panals in the same color of energy in the robot. Those panels receive the energy being fed off by ports in the wrists and feet of the robots. Thus giving the robot a sort of "mind control" over the suit. This makes it IMPOSSIBLE for any minifigure to take control of the suit. Note, this is why other parts of the suit glow the same color, because it's being fed through the suit as a whole. It's what powers the weapons, the suit, and everything else. As researchers have found out, the longer a robot pilots the same exo-suit, the more the suit becomes self-aware. Almost as if it is slowly linking its own processor to the robot pilot, learning the pilot's thoughts and thought-processing.
One last place holder, your on the last stretch (of this slide)!:
Eventually, the suit will be able to fight for itself even when there is no pilot in it. Luckily, it seems like that would take forever. The only thing I would say to you, is to stay alert, there have already been reported encounters with the suit already fighting for itself even once the pilot was removed, however, it wasn't quite "aware" of what it was actually doing. So, even if it is piloting itself, it most likely won't be very "smart" yet.