https://forgottenrealms.fandom.com/wiki/Asura
In Hinduisms while at times it can refer to evil spirits, it's abit more complicated then that. For example I think the Rig Veda references the Indra as an Asura, and that was written back when Indra was a lot more popular then he is now.
Asuras is D&D are basically similar to Angels, but more Chaotic to the Angels Lawful inclinations,
serving Gods of Good (and some times Chaos). They see Devas as rivals.
There were a type of more powerful Asuras I believe and at the top an Asura general.
I could see WotC merging the Asura into Angels, a type based on the passions of a God, where Devas would be the thoughts of a God
It's be an interesting twist if instead of a Solar, Planetar, or Deva, Zariel was a Asura Angel, so falling from not just good to evil, but from choas to lawful as well.
Oh, for sure. It's complicated (like many aspects of Hindu lore). But, on average, asuras tend to be adversaries and serve as the 'bad guys' more often than not. Anyway, I don't have any problem with the use in D&D. I had just missed it.
AD