The description for the Tech Wings reveal that they aren’t Dexter’s machines, but rather were created by Fuse from discarded parts. From a closer look at some of the concept art, it seems that some of those parts might have come from Dexbots, or at least an early version of them, as the chests of the Tech Wings is a very close match--if larger and with a few altered details to the design.
The Tech Wings are based largely on bats, more specifically carnivorous ones like the Fishing Bulldog Bat. I say this and not, for instance, the vampire bat due to their methods of attack. Vampire bats strike from the ground, then bite and lick the blood from their prey. A bat like the Fishing Bulldog, meanwhile, will snatch up its prey and eat it entirely. This better fits the Tech Wings since they typically attack while still in the air--either firing ultrasonic waves at their targets or raking them with the claws of their feet. I see it possible for them to snatch up soldiers only to drop them from daunting heights as well. While their teeth are blunt, they also still have a fierce bite.
Despite this, according to their concept art, they actually flap their wings more like a dragon as opposed to a bat. This is because they aren’t nearly as agile/flexible, being largely mechanical, and lack both the fingers and stretched skin of real bats. They’re fast flyers, but lack the same level of maneuverability.
They utilize more fusion matter itself in their creations, as evidenced by their wings. Unfortunately for them, while this makes their wings more nimble compared to other parts of their bodies, it also leaves them more exposed to imaginary energy (IE). Attacking their wings to down them is a good strategy, as they have difficulty walking.
The Wild Wings are the higher-evolved form of the Tech Wings. “Answering to no one,” they seem to be a bit much for anyone other than Fuse himself to handle, even the fusions leading his army. They are extremely powerful and aggressive, and aren’t easily intimidated by anything. According to the Wild Wings’ description, Mojo Jojo has a lot of trouble dealing with these fusion monsters in-particular. The mission “Making Friends with Mojo (Part 1 of 4)”, reveals that they, along with the Doom Diggers, try to steal Mojo’s technology. While his personal army can face them on a level playing field in the skies, unlike most other fusion fighters, the Wild Wings are simply too powerful--to the point that it can take multiple fighters to take them down. It’s better for highly-skilled soldiers to face them as, if the numbers are reversed, a group of Wild Wings can overwhelm a fusion fighter very easily.
We see from the events of the Future that the Tech Wings were able to survival the length of the war. Already being made of various spare parts, they didn’t need the same level of maintenance required of other fusion monsters based on Dexter’s robots. If anything, parts left behind from the ruins of Tech Square and Dexter’s forces would only give them more material to piece themselves together from.
