This is my personal interpretation of how Halo 6 should be. This does not mean if 343 does not copy my exact wishes then I will consider the game to be crap. This is simply just an opinion. 
People, I’m gonna be honest with you. I hated Halo 5. Despite the really fun gameplay(even if it was different from true Halo), I still could never get past the horrible art style, the plastic look, awful toy like sounds, hideous spartans that you couldn’t even tell apart, and the req system. DON’T get me started about that campaign either… SO obviously 343 messed up, so what exactly needs to be done? MAKING ONE HELL OF A GAME THATS WHAT! How are they gonna do that you ask? Easy. Cater. to. the. Fans. This is something that 343 has failed to to do since the very beginning. And the time to do it has never been more right.
First off, Halo 6 NEEDS no SPRINT. This does not need to be argued at all. It’s simple, you have a collection of fans who are completely done with Halo because of this feature. “Oh well they just can’t handle change. The people who are still here are okay with it because they can accept change!” Okay well those new “Halo fans” better prepare for some more change because Halo needs to back to no sprint. It’s pointless and just an illusion. Don’t think about it as Spartans should be able to run, think about it as spartans should be able to shoot and run at the same time.
I don’t want to take too much time in how the multiplayer should play out but I do want the reader to get my idea with one question. Could YOU IMAGINE a next gen Halo? NO, not Halo 4, 5, heck not even reach. I mean a true successor to Halo 3 on the next generation of Xbox. THAT’s what Halo 6 needs to be. No,and I don’t mean a pretty re-skin of Halo 3 at 60 fps. To accomplish this, 343 would need to move the base speed up a tad(to CATER to fans with ADHD and well lets be honest, Halo 3 was soooo slow especially compared to 2) also they would need to alter the FOV. Paring the classic gameplay with 343’s perfect balance of weapons(something Bungie failed to do, looking at YOU BR…) would prove to be a very strong game.
The most important trait of Halo imo is the Art Style. Halo’s look has become just as iconic as star wars. So why the hell would you try to change star wars. BRING BACK THE CLASSIC LOOK. it’s simple, the old looks better in every way possible. You KNOW you got a problem when Halo 3 sometimes looks better than Halo 5.(seriously, I’m not joking.) Spartans look like power rangers with complicated as crap armors that prove no variety and are not visually appealing. Even the BEST armors of Halo 5 look RIDICULOUS in terms of cohesiveness and actual use. Even classic armors brought in from previous games like Reach, Halo 3, 2 all look like plastic due to the crappy art design (And bad lighting that the Beta lacked). Covenant, aside from the jackals, NEED to return back. Especially the Elites. Prometheans HAVE to be retconned. WE all know 343 has a weird turn on for Lore and likes to keep everything consistent but honestly who cares. CHANGE the prometheans. Make them actually look like they are related to the structures found on CE,2, and 3! 343 guilty spark looks completely different when compared to his promethean brothers. WHY is that? AND STOP WITH THE FLOATY BITS. It’s not cool anymore. (side note, if you want to see how bad the prometheans look, look at the sentinel beam in Halo 5 and compare it to the sentinel beam in halo 3)
343 must also find Halo’s identity again. Halo is a MILITARY shooter. Not an anime ninja shooter simulator. Make the spartans actually act like soldiers. They aren’t AVENGERS, they Aren’t POWER RANGERS, they are most certainly not BATMAN. Yes we know they can do incredible stuff in the books, but which one sold 12 million copies? Halo 3, or the Halo books? The games dictate the books, not the other way around. Bring back the stereotypical military personalities of the marines who fight(and most likely die) with you. Bring back that military presence!
Campaign:
343 may have screwed the story of Halo 4 with the release of Halo 5, but they haven’t completely screwed Halo 6. Halo 6 could have an amazing story. And here is how: So obviously Cortana has the world on it’s knees right now with all the power she has rn. SHOW THAT. Show that the human race is -yoinked!- with how much power she has. And the chief and the UNSC? they are losing. Maybe set the game 2 years after Halo 5 and depict a war torn master chief. He is tired. Beaten. The opening mission would be perfect to start with the Arbiter and Chief trying to regroup with the remnants of the UNSC. Arbiter could be alongside chief, or he could be with his people fighting or something. STAY AWAY from those pathetic Spartans you made in Halo 5. Fireteam Osiris needs to just die… Buck should’ve never been a spartan. just put him aside. (yes I know Nathan is a bad -Yoink- but this is best) Blue team should not be focused on either. It used to mean something when marines saw a Spartan. Now they are popping up like candy. KILL PALMER(Either that or get her voice out of my head in WARZONE) The most important thing of all for the Campaign however is BRINGING IN A NEW SPECIES. The Youvaht(IDK how to spell their name) is perfect for this as they were mentioned/called upon by cortana in Halo 5 and shown in Halo nightfall. Make something about them special and unique. Miniature mech suits perhaps? or since they are a little human looking, should they have sorta similar spartan suits for themselves? engaging against other armored baddies in the campaign would be a welcomed fresh experience. Also make the campaign non scripted like Halo 3. Don’t make us beat the kraken in a linear phaeton battle! Give us the ability to either destroy it from the outside, or board it and wreck it from within! (Scarab from Halo 3) . ADD ALL OF THE WEAPONS ever in Halo. Halo 5 has a ton go weapons that are only seen in the multiplayer or if you’re extremely lucky with req packs.
Multiplayer:
Halo reach style customization and earning system. Make everything look like it belongs together. This means most of 343’s armors would need to be reworked, and thats not a bad thing. Playable elites are a MUST no way around that. Crucial point: The multiplayer should be divided between two modes, Competitive/traditional and Party mode. Party mode can be crazy with weapon skins(hate them so much) and pretty much everything goofy, While the competitive mode would be conservative and equal to old halo games that took itself seriously. Voting for maps is a must. The Old Announcer needs to return with HIS original voice. Not this chipmunk version that has a sugar rush constantly. NO REQS. Everything you have should be earned. Game modes like warzone need to be reworked in order to provide a more Halo experience. Vehicles spawning on the map alongside weapons is much better than calling things in. Although the whole req system could still be a thing in the “party” section of Halo 6. Forge on day one. Custom browser. Working Theater mode. A slew of gamemodes.
While this entire thread could indeed look like a hungry kid’s wishlist for Christmas, I want to ensure y’all that this is ALL possible. 343 is not incompetent. Putting the foot down with Microsoft and putting all of their efforts into Halo 6 could provide a truly great Halo experience. Your thoughts?