[@Errant Son]
I lovr explaining so you came to the right GM!

So lemme start with the first part. They are not necessarely bigger, rather more...dense. They are like a snake in that sense. Even a small are is FILLED with muscles. And the scales are also quite heavy. They look like us for the most part, with a look that is like an ideal human. They were created to be the perfecr human. But in that sense they weren't human enough for the scientists. So technically they can operate standard gear.

Technically. In any combat enviroment they will use up so much energy they could die. Their armors deliver proteins straight to their bloodstream. And so they rely on them heavely. One flaw. Also Lex is of the horned race amongst his species. Excellent fighters, but they have no emotional control. They can go into a bloody fury if they lose control. Not a killing spree, but still bad. For this AGAIN their armor limits their adrenaline priduction. Their planet was simple enough, but it had one huge flaw: a different atmosphere. It is hard to get soldiers who suffocate without enough CO2. They were made to make humans breathe CO2, but it failed.

Best imagine them like Navi from Avatar.

Humans are not their creator's I'd like to say. They were humans once, created to be experimented upon. The elders still know about the human world. They simply refuse to be greedy like us, and rather live with the nature. It is about 200 years since they were abandoned. So now humans seem exotic and weak, and they don't get how humans still control the galaxy and other races, even thought they are greedy and seek only power.
Like a wise man once said: "Humans are common and uninteresting. But once they see a gold's glimmer they become fascinating predators"

So like I said beforehand, the Draken are primitive, not unintelligent. They can comprehend all that humans can, thought their lifestyle might stop them from undersranding certain things (like advanced fusion and pop music.). They have their own measurements and maths, so they are more like different humans who don't rely on tech as much as we do.

Ps: I know, after all they are half human an one third reptilian. And thr rest is a mix. Also I made it to tease your German genes :P