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For humanoids: Longer torso would be needed. The most logical (based off earth flight models) is actually for the wings to be superior to the arms, rather than inferior. This is due in part because of the desire for a keel bone as muscle attachment, And that any lower down you have nowhere for large muscles to attach (abdomen) and any attempt would probably inhibit rib cage, and thus lung, expansion.
That said, aren't angels supposed to be rather... immaterial? Thus, physics as we know it don't really apply. And equally, the idea of 'wings' is often a sign of power. There are many people where they have wings on their astral form, or auric form, who are not angels or any type of celestial. This even plays out in the choirs of angels doesn't it? The 'higher up' the more wings... the more power! <!-- s

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As for dragons: No, they are NOT necessarily having more energy. SOME of us were entirely this-universe physical. That said, the only reason why adult shinoar could fly was due to being on a planet with lighter gravity, as well as one with near constant winds at altitude of at least 35mph. We were 7 feet tall at the *head* and most of that was leg, about 15 feet long, and had a wingspan somewhere between 32 and 36 feet. The width of the wing membrane at widest point was between 5 and 6 feet. I estimate we'd weigh about 500lbs here on earth.
Main biological reason for belief of lighter gravity: Our deciduous tree-types were easily the size of redwoods. HUGE! D:
Our limb arrangement was wing first, arms secondary and very limited with regards to range of motion, then legs.