(Fair warning, this is a stream of thoughts from redesigning Escoco. Escoco is from Project Tiyaka, an old project of mine that I've entertained new ideas with. Escoco is a humanoid dragon, crazy right...?!?! I do talk in depth about anatomy and guts, so fair warning. If you're wondering what I'm up to rn though, my Twitter is mostly up to date at the moment. Otherwise...)

...So what about the wings? The main thing is that they would need to generate lift. but how would they connect to the back? The trapezius mainly connects the shoulders to the spine to lift them up right? So what if the deltoid for the set of wings was in the muscle layer right under the trapezius? That would interfere with the other muscles a bit would it? Having a purely muscular connection for the wings on to the torso would cause a lot of strain wouldn't it? So what if we were to thicken parts of the skeletal structure? Ok, if we do the ribs, that causes a lot of strain. If we find some way to connect directly to the bones that make up the spinal column, that would cause a lot of pressure on the spine, causing higher risks of herniated discs if there isn't compensation. And since the wings I would say... weigh 20 to 30 lb... even with hollow bones. the spinal column would need a good amount of compensation in the ligaments that cushion the spinal column. Ok, so we have a wider spinal column. This may make it harder for the character to most their torso, but that's ok. Most of the movement they need is in their neck, arms and wings.

Their legs would also need to carry the weight. so thicker bones, larger footprint (literally). And some sort of way to compensate for the fact their COM is moved backwards. Wait... is that why most dragon characters are drawn with those bent legs? I think that would be helpful to change the location of the COM over the feet and since they have a tail, it would help to increase their footprint area and stabilize them if it was on the ground a good portion of the time. Ok cool, we have weight distribution down.

What about the lift that wings create? We have two animals that have different flying styles. Bats and birds. Birds have good lift with their wings. Better than bats right...? (after a bit of googling) Ok, nevermind, bats have better control over their wings and have more senses on their wings so they can do better acrobatics. However, to keep the idea of an airfoil for Escoco's wings, having the bones slightly curved, mostly in the front and then straightening out in the back, would help give him more lift during flight. This would also reduce the amount of energy that is needed to actively fly, with most of the force going into keeping the wings static. So bat like wings are kind of better in this case for Escoco, more control and shaped an airfoil so that having his wings static is the only energy he needs to expend.

This makes me highly concerned about circulation. If the wings have similar artery sizes at the beginning similar to the femoral artery, it should be mostly fine, but since the lower ends of the wings would have low circulation, they might need to be mostly some kind of collagen and bone. It still with be innervated and have veins, but less. Escoco's heart would have to be bigger so that he could supply enough oxygenated blood to his wings. His lungs would also have to be bigger for lower pressure, I have a feeling that a limitation would be that Escoco can't climb or fly to mountains higher that humans can due to needing extra oxygen for the extra limbs and being at a high altitude.So Escoco would either have larger lungs, or more effective alveoli, which is near impossible as the human lung is quite efficient with maximization of surface area. So larger lungs, or just diver's lungs.

I think that's about it, without the obvious, being a large creature, Escoco would need a lot of energy consumption to keep up with the demand of extra muscles and use of said muscles.

This all said will be reflected depending on the weather that Escoco is in as it would limit certain functions in certain weather and resource conditions.

Ok, cheers for now!