Remember when I said that flying creatures are a nightmare to design?
Well, looks like dragons and gryphons were just the beginning, we still have two other species to cover, and they're worse.
Humanoids with a separate pair of wings- Be it angels, dragon-like humanoids, or bird people, they don't look like any other flying creature, therefore I don't have a clue how they'd take off.
On paper, they have six limbs, the extra pair being the broad soaring wings. They're located under the arms and towards their back. I leave the details at that for now.
While birds are upright, their wings have a different angle of attack than winged humanoids. Furthermore, winged humanoids have weaker legs, compared to birds.
Well then, let's assume we managed to get the right mass fractions (large fliers need 20-25% of their total mass to be their flight muscles), and with the help of tissues made of flexible biogenic aerogel, they have protection against blunt force trauma to a degree, plus it makes them look bigger without adding weight.
Okay? Well then, assuming they can fly under their own power, how would they take off to begin with?