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All of these could vary based on what sub-type they are (Dragoons having the best):

-Tough hides, which can absorb the energy from at least one or two direct hits before taking serious damage.
-Stronger skulls. Possibly have heavy facial bone structures, leaving a weak area on the back of the cranium.
-Faster? Drathonians are lizard-like and excel in melee. They would likely be quite fast despite their size. Kai hinted that they move faster than humans.
-Natural weapons (tail, teeth, claws) should probably play a large role in close quarters.
-Impressive jumping/climbing abilities?

-Ship hulls are durandium. It would take a considerable amount of focused fire from a Sugar to knock through that. It's been mentioned that a Sugar can rip through a hull in one shot.
-There needs to be a reason to have guns that AREN'T sugars. So far we only really use the 1-handed bro and a couple of stealth models. The Sugar isn't PERFECT, but I don't know why. It could use a bit of clarification.
-BROs aren't the best SMG. We need to make some more variety in the field of compact guns. There are a variety of specific purposes different models serve.

-Yes, we might want to consider changing the sizes. They need to be BIGGER!! twisted jk jk
-Scimitars are what, 3 meters? Should prolly be bigger.

-Why are our marines always trudging around? There was that brief moment where we got to use a nondescript APC. We need us a Warthog.