Gundabad Warband Warrior 1 (heavy amor, upgraded version)
Gundabad Berseker Champion 1 (half leather & half heavy amor with war orcish sword-pickaxe)
Gundabad Warband Warriors & Spearman (half heavy amor, basic version)
Gundabad Marauder Champion 1 (leather armor & 2 war orcish sickles)
Gundabad Headhunter Captain (half heavy amor)
Gundabad Warband Warriors & Gundabad Headhunters (full heavy amor, second upgrade)
Gundabad Berserker Champion 1 (half leather & half heavy amor)
Gundabad Marauder Champion 2 (Leather armor)
Gundabad Warband Warrior 2 (full heavy armor, second upgrade)
Gundabad Warband Spearman 1 (Spear & full heavy armor, second upgrade)
Gundabad Berserker Captain (half leather & half heavy amor)
Gundabad Avengers ( Orcish Cleaver & full heavy armor)
Pale Orc Champion (Dol Guldur's Torturer & Dungeon's Keeper, half heavy armor)
Gundabad Warband Warrior Captain (in center, full heavy armor, second upgrade)
Gundabad Legionares (perhaps you could make those red bat banners too in a banner re-skin, full heavy armor)
Gundabad Marauders (half leather armor)
Gundabad Berserkers (half leather & half heavy amor)
In the last upgrade, the armor & weapons could have this tones: