These are early versions of enemies that appear exclusively in The Art of Destiny Volumes 1 and 2. Above is Protheon. Though many of these don't use in-game assets, they very much fit them, so I had myself a go.

Destiny:
Legionary (Generic, Green, Blue, Black, Gold, Purple)
Fallen Ultra
Vandal (Devils, Winter, Kings, Wolves, Shattered)

Destiny 2:
Brakion
Hive (Acolyte, Knight, Wizard)
Red Legion (Legionary, Gladiator, Centurion)
Loyalist (Legionary, Incendior, Centurion, Colossus)
Bather
Bloodguard (Legionary, Incendior, Centurion)

UPDATE 7/8/22 - Filled out armored D2 Centurion foot armor

UPDATE 8/3/22 - Fixed D1 Vandal undersuit coloration

UPDATE 4/3/23 - Fixed belts for D2 Cabal variants that needed it

UPDATE 5/8/23 - Changed heads on D2 Cabal variants for Project Head Reassignment Surgery