Alc0h0lic0

What if each colour of their wings corresponds to their initial purpose?

For example. Gabriel, God's will. All the angels we see have what wing colour? Right. Blue. Blue winged angels might be in hell, serving justice. At least that's what I assume.

Then there's Michael, God's wisdom. Maybe he is a part of the holy council? He wears a lot of clothes. Definitely no fit to fight. But it looks pretty expensive and shows authority. So my assumption is the council here.

As to Raphael, God's strength... Maybe it corresponds to heaven's inner power, inner strength. While Gabriel serves justice in hell, those might be protecting the heaven itself.

Lastly, Phanuel, God's patience. Here, I'm unsure what it could be. But it would be nice to hear out other people on that.