I want to see brutes in all their forms, like jumpack troops, stalkers, shielded troops (Halo 3), unshielded troops (Reach), and chieftains. I want to see drones, skirmishers and engineers too. More variety in the hunters would be nice as well. They tend to be treated as "minibosses", so we hardly ever see them I'd like to see more of them as regular troops, like in the first Halo.

The prometheans need way more enemy types, too, and for the existing ones to be less annoying. The crawlers are fine and the knights are alright (they could stand to have weaker shields), but the watchers are obnoxious.

Same goes for weapons and vehicles. I'd love to see the chopper make a comeback.

I'd also want more interesting weapons. There are so many redundant weapons in Halo 4, between the BR/DMR/carbine/lightrifle, AR/storm rifle/suppressor, shotgun/scattershot, and rockets/frg/incineration cannon. Why not bring back some of the fun weapons like the flamethrower from H1PC/H3/ODST or the grenade launcher from Reach? Give the covenant their plasma rifle back. Let the prometheans have some truly alien weaponry.