Angels as a race.

Prince Omega and others:
Complete invulnerability can still be compensated for.

Tenro:
They didn't try hard enough.

Ataman:
Why remove the griffins? They aren't angels.

Buddha:
Read some books and you'll find out how many levels of angels there are. There are more than seven!

Paladin Rider:
That's the point, angels protect people! And demons - separately? If they protected servants, cultists, Satanists, I would understand...

Now I'll list the units...