Angels of Desire.

Each angel has their own corresponding desire that may be linked to their past life, but Angels are incapable truly being able to express their desires. However, Angels of Desire are different.

These Angels can act on their desires without too many repercussions, as they have gone beyond angels in a way.

Desires of angels may be their dying wishes, lifelong dreams or simply a thought that passed by them. They vary through each angel.

The desire can shape an Angel. If an Angel doesn't hold a desire, they are merely the puppets of God.

Depending on the desire, they can manifest as different things: weapons, memories, people, etc.