Remember this is my list and a list of other fan’s. If you disagree with my list, please comment your list or opinions.
Vehicles:
Hornet, Falcon, Troop Warthog, Revenant, Reach Civilian Vehicles, Chopper, Prowler, Passenger Scorpion, old Gungoose (the one that shoots classic bullets, not grenades like the new generation), Elephant, Sabre, Spectre, Seraph
Weapons: Concussion Rifle, Plasma Rifle, Flamethrower, Brute Shot, Mauler, Spiker, Focus Rifle, Spike Grenade, Needle Rifle, Plasma Launcher, Plasma Repeater, Sticky Detonator, Pulse Grenade
Enemies: Flood, Brutes, Sentinel, Enforcer, Constructor (but Constructors were in the last cutscene of Halo 5: Guardians), Skirmisher, Engineer, Drone, Prophet
Misc: Split Screen, Dual Weilding, Playable Elites, Non-linear levels, No Micro Transactions, Halo Ring Gameplay
Out of this entire list, here are my MUST HAVES:
Vehicles- Chopper, Prowler, Falcon, Passenger Scorpion, Troop Warthog, old Gungoose, Revenant, and it would be really cool for the Elephant but it isn’t that essential
Weapons- Needle Rifle, Flamethrower, Brute Shot, Mauler, Spiker, Plasma Rifle, and it would be kind of cool for the Plasma Launcher and Sticky Detonator but it isn’t needed
Enemies- Flood (well duh the entire Halo Fanbase wants them back), Brutes, Drone, Skirmisher, and it would be really generous to add back the Prophet but it isn’t as important
Misc- Dual Weilding (it is EXTREMELY IMPORTANT to have this), Playable Elites (again, really wanted), Split Screen (was really fun when it was here), and no Micro Transactions
There… those are features from previous Halo games that need to return. Be sure to comment your list or opinions!