1. Add character selection.
It bums me out than I can only play as Buck in a co-op. It’d be cool if I could select him as my character in single-player for Campaign Score Attack, or any other character for that matter… Tanaka, Vale, Locke. Each of the members of Blue Team when you get to play as them. You get the idea.
2. New REQ items.
I would love to have a way of getting all the new REQ items introduced in the updates into Campaign somehow… ONI Wasp, Hannibal Mantis, Phaeton Helios, Safeguard Sentinel Beam, Halo 2 Battle Rifle, Halo: Reach Grenade Launcher, Halo 1 Pistol, Brute Plasma Rifle, the Blood of Suban needle carbine variant… these are just a few toys I’d like to see in campaign.
Maybe introduce a loadout system to the campaign like in Halo: Spartan Assault. Let you choose your starting weapons. Earn points by playing Score Attack, spend those points to permanently unlock REQ weapons and Armor Mods for your loadout in the campaign. It would add replayability to the campaign where there currently isn’t any. Not sure how vehicles could be worked in, but I’d like for 343i to find a way… maybe place REQ terminals for calling in vehicles at certain points? For example, whenever you get to fly a Banshee or Phaeton, you get a terminal that lets you call in any air vehicle, including Wasps. I don’t care if it breaks immersion; the story of Halo 5 is crap anyway.
3. Add Halo: Anniversary Skulls.
Halo: CE Anniversary and Halo 2: Anniversary have the most entertaining skull modifiers of all the Halo games. Bandana would go nice with the aforementioned REQ items, allowing you to run through levels with unlimited ammo for your Halo 2 Battle Rifle or Halo: CE Magnum. Skulls like Grunt Funeral, Recession, Malfunction, and Scarab could make the game infinitely more entertaining.