The Prometheans have been a source of long debate, but many can agree that they aren’t the most fun to fight. While mostly improved from halo 4, they can still be vastly improved. So I, Arc Trooper, am up to the challenge of trying to make them fun to fight. I’m happy with any suggestions. I know this is long, so I’ve bolded the discussion points if any of you want to just check a few out. As this is a feedback thread and I want 343 to see this, I’m notifying Ske7ch 
The little variety of enemies: There are too few of them and the ones we have aren’t that fun. In halo 4, we had the Knight, the Crawler, the Watcher, and I guess those automated turret things. I wouldn’t really count turrets, and the Watchers are more support units than enemies. Halo 5 added the soldier, essentially giving us 3 offensive enemies. Even in CE, there were at least 4 offensive enemy types. Some may say “but the Flood only had 3 types of enemies in halo CE and 2.” Yah, and nobody liked the Flood in those games. Having only 3 real enemy types can get dull and repetitive fast. So along with adding a few more enemy types (I suggest 2 if you guys at 343 have the time and resources), I have some changes to the enemies themselves.
Crawlers: This is one of the few times where I think halo 4 did them better, at least in one area. This area is how they added verticality to gunfights by climbing up walls. This made them a unique enemy to fight and were more of a cross between grunts and drones. In halo 5, even though it was post launch, I like how 343 added an explosion effect to them, damaging enemies around it. IMO, one of their flaws in both games is how they have too much health, making body shots and melees not very effective. With the grunts, a body shot stuns them and a melee is always a one hit kill. With the crawlers, body shots can slightly stun them and a melee is sometimes a two hit kill (depending on the Crawler). What I’d like is if a crawler is shot while climbing on a wall, they’d fall off it, along with less body shots/melee shots to take it down and having it stun them more. So to review with the crawlers, I’d like them to have less health, the headshot explosion effect, and to crawl up walls.
Pack Leaders (new enemy type): I know there were many cut Promethean enemy concepts in halo 5, and I believe this was one of them. So these guys would essentially control the crawlers. When it is alive, the Crawlers would stay near it and focus fire on you or your allies. The Crawlers would only retreat if the Pack Leader retreated. If the Pack Leader died before all the Crawlers did, the Crawlers would fall out of line and act like they do in halo 4 and 5: basically running up, shooting you, then running away. If the Crawlers died before the Pack Leader, the Pack Leader would either retreat back while trying to shoot you, or they’d pull out a melee weapon and charge at you in a last ditch effort to kill you and survive. Note that the Pack Leader only pulls out its gun or melee weapon when all the Crawlers are dead.
Soldiers: I have quite a few problems with the soldiers. For starters, without energy shields, they have stronger armor than Mjolnir. So right off the bat, I think they should have less armor. I’d like them to somewhat fill the role of the Jackal on the battlefield, and in some ways, they already have (snipers). Instead of having shields similar to the Jackals, these would be the only Promethean type to have teleportation, bur this teleportation would involve portals. Unless outnumbered, they’d use the teleportation as an offensive move instead of using it to retreat. They’d teleport to cover, behind you to try and flank you, to high ground, next to you to quickly melee you and then teleport back to another spot, or pretty much anywhere. They’d essentially be using Guerrilla tactics to attack you. To balance this, like I said above, they’d have relatively weak armor. I’m going for about 2 pistol/DMR/BR shots to break the armor, then 1 to the head to kill it. Just like the Jackals, I want the Soldiers to be the annoying enemies that everyone hates, but are still fun to fight. More on the soldiers’ teleporting ability in edit 2.
Centurions (new enemy type): These are probably my favorite out all my ideas just because of the potential they have. The Centurions would mirror the Spartans and Elites, which would also give them the potential and possibility to be playable in campaign or multiplayer. They would be humanoid and 7 ft tall. They’d have shields that’d be about as powerful as elites. When the shields would break, their heads would be vulnerable for a headshot. The Centurions would also phase like the Phaeton does as a thrust. This would also carry over to multiplayer if they’re ever added in. They would each lead a squad comprised of all types of Promethean enemies. I know they may be just reskins of the elites, but according to a waypoint thread a few months back, the majority of people said that elites were their favorite enemy to fight, so why not make a similar enemy for the Prometheans? Besides, it’s more of what they can add to the story and the lore. For the lore of the Centurions, I’m gonna jump to a new paragraph.
Cortana needed an independent but loyal mind on the battlefield, so using the Domain, she created unique AIs that would be placed in robotic bodies called Centurions. Her knowledge of the Spartan program caused her to create the bodies in a very similar way to Mjolnir armor, making the Centurions appear to be Promethean Spartans. Cortana knew that the ability to think independently could lead to her being overthrown, so she intentionally made them weaker than Spartans. As more checks to prevent an uprising, each AI would be locked to their Centurion bodies, so if the body was to die, so would the AI inside. If everything went well, the Centurions would be bring a human element to her Promethean army and efficiently lead her forces.
So the fact that the Centurions are independent thinking AIs would give them personality that the Prometheans don’t have. It also opens up the opportunity for a Centurion to rebel against Cortana just as the Arbiter rebelled against the Covenant. Maybe not for halo 6, but I think it’d be a good idea for a future halo game.
Knights and Watchers: I wouldn’t really change anything here, as they are in a pretty good spot in halo 5, except for one thing. I’d just change the knights so that it isn’t really required to shoot their glowing yellow orbs to kill it (so more weak spots besides the glowing orbs). I think they should also be splatterable. More on the Watchers in the first edit in my second post.
So the Crawlers would fill the role of the grunts and drones, the Soldiers would fill the role of the jackals, the Centurions would fill the role of the elites, the Knights would fill the role of the hunters, the Watchers would fill the role of the engineers, and the Pack Leaders would be an entirely new kind of enemy. However, they’d be different enough to not just be reskinned Covenant, but would still be fun like them.
Because I don’t have enough space to write the vehicle portion, I’ll just write it in the next post.