One of my biggest disappointments with the story of WoW was the Army of the Light, that had been the subject of one prophecy given to Velen and the Draenei by the Naaru, and was at the center of Velen's shorty during the Cataclysm, with this army having been promised to be a great coalition of many races in the universe saved or rallied by the Naaru to face the Burning Legion and the darkness of the universe.
Yet when we finally saw the Army of the Light in Legion it was turned into just a small army of Lightforged Draenei with X'era, Turalyon, Alleria Windrunner, Lothraxion and a few NPC being the only non-Draenei members of the army, with no new race being a member of this organisation.
If you could rewrite the Army of the Light, what would you make of this faction ? What new races or beings would you have created to be members of this army ? What new weapons, equipment, tech would you have equipped them with in addition of what we saw in Legion such as the Warframes, the ships and laser cannons ?
I for sure would have created many new races to be members of the Army of the Light, including one living crystal humanoid race, one faery-looking race, one wyrm-dragon like race able of flying but who breath light instead of fire, one similar to the Gelflings from the Dark Crystal franchise, etc...
The Army would have been far greater in terms of number of soldiers, ships and weapons, with many Naaru and prime Naaru serving as leaders instead of just X'era, and the Lightforged Draenei would have rather served as experienced officers but still relatively few and so far from the majority of the members of the army, I would have also added some magic and tech techniques and they would have been a greater opposition to the Legion across the universe.