As we all know, Warzone is just a simulation. The variety for Warzone Firefight is really good, it’s very rare to get the exact same game or even two identical rounds back to back (Of course it’s possible), however, we may end up getting bored of the Covenant and Prometheans sooner or later (I hate Prometheans already to be honest), so that’s why I think we should also see more variety with the enemies we fight.
Why not add Humans into the rotation? Marines maybe easy to kill, but having Spartans mixed in with their own look apart from ours, then they’d be the Elites of the humans. The Hunters/Knights of the Humans can very well be the Cyclops from Halo Wars with it’s own unique move-set. This can be used as a legendary take down or just an average enemy to kill. As far as vehicles go, have Wasps, Scorpions, Gungooses, Warthogs, and Mantis be some of the vehicles we fight that the humans use.
Even though we have enemies and vehicles to fight, we still need something special to fight if not than it’ll still remain boring. Covenant have Grunt Mech, and the Promeths have Warden Eternal. So here are three Mythic/Legendary bosses we could fight-
A Big Turret:
Yes, I mean a BIG turret. A Turret that is dropped from a Pelican as a box, then unfold as a massive turret dropping off marines and Spartans to protect it. This turret has Anti-Air and Anti-Vehicle turrets so it will be deadly fighting it head on with vehicles with small enemy controlled turrets to attack infantry and any vehicles straying too close. The Turret will have a heavy shield but upon destroying either the shield generator inside or shooting it until the shield goes down, then the Turret itself will go down quickly and easy. The Shield Generator would be easy to destroy but guarded heavily by many marines and Spartans (The marines are infinite spawning, but the Spartans will not respawn). This would be available in both Warzone and Warzone Firefight.
An Incendiary Rogue Spartan:
A Rogue Spartan that has been burned to nearly the point of death has made the fire his weapons. He will be holding a Halo 3 Flamethrower and will occasionally throw incendiary grenades. His shield and health isn’t a lot, he will have the amount of health of three elites and shields of five elites. He will not be accessible by vehicle so he will be in areas where you will only be able to kill with weapons. He will be able to fly/hover around his area with his boots (Basically jet pack boots), he will be screaming a lot of cheesy burn puns (Burn, baby, burn!) and when you get his health to 10%, his shield falls off and gains back all his health (I mean it’ll take like 5-7 headshots with a BR to kill him at this point) and he will begin charging at everyone with a Vorpal Talon energy sword while screaming. Upon killing him, he will catch into flames and fall to the ground. When he is charging, you will be able to assassinate him as well if you’re lucky. This would be available in both Warzone and Warzone Firefight.
An Elephant/Mammoth:
An Elephant is a vehicle that we see in Halo 3, while a Mammoth is seen in Halo 4. I believe the armory and weapons of a mammoth with the size of an Elephant would be a good fit for Warzone, this vehicle will be able to move (pretty slowly) and will be able to tank a lot of damage from vehicles. It would have cyclops, Spartans, and marines protecting it with Warthogs patrolling. It will have the turrets on the sides including 1 Gauss Turret, 2 Chain Turrets, and 1 Rocket Turret. The driver will be protected by a door, so the only way for Infantry (Us without vehicles) can destroy it without power weapons is by infiltrating the Elephant/Mammoth and destroying the core. The core will be guarded by automatic turrets (Upon being destroyed they will not return) and as well with infinite spawning marines with a 30 second timer and infinite spawning Spartans with a 45 second timer. Only 3 Spartans and 10 marines will be able to spawn at any time, so after 3 enemy Spartans spawn, no more will be able to spawn until one dies which will begin the 45 second timer. It’s 2 Spartans every 45 seconds and 5 marines every 30 seconds (If enough space). The core will be as strong as the core you destroy in regular Warzone/Assault, and will directly be impacted by the damage it has received by any vehicles outside (50% destroyed by vehicles, core can only take 50% before being destroyed, this way so people without vehicles will have a chance to help take down a Mythic or a Legendary. This would be a Warzone Firefight exclusive.
This would also be a good chance to add new REQs such as the Elephant/Mammoth at REQ level 8/9, and also Halo 3 Flamethrower. 
Tell me what you guys think of:
A. Having enemy humans in Warone Firefight.
B. The bosses I have given you an example of.