Customization can use an overhaul.
Here are things that i think are missing for sure.
Gender:
You get the option to play as male or female, however, there is very little to no difference in the appearance, in the older versions, you could tell the female skin from the male. As it stands the only way you can slightly tell is bringing in the waist and unfortunately being very selective with the armor pieces or stance you use.
Races:
We only get to play as the spartans. Why not bring back the ability to play as the covenant, and even expand and introduce a forerunner skin.
If we go further down the rabbit hole there are so many more customization options, aka grunts, marines. Tons more but obviously that would take a lot of development. So this is more a pipe dream.
Weapons:
First off why not let us choose our basic weapon set up. For example you cam choose between a BR or an assault rifle as your primary. Obviously secondary will always be a pistol.
That being said why not let us get to choose and bring back covenant and forerunner weapons as well. I doubt itd take a whole lot to tweak applicable weapons to bring them pretty close if not exactly the same only operate differently.
Skins for weapons:
To be honest make more custom skins, and strip the paint pallete for the default colors and let us choose how we want our weapons to look. This is one area where halo massively falls down to other fps. Weapons customization is so huge. And yet we can only do a solid overall paint scheme instead of individual parts on the weapons.
Skins for melee weapons:
Im not sure how easy this would be, but if skins on weapons we pick up can be changed why not do something for the sword and hammer. For example have elemental skins that can be attached like how we have for armor.
Mods for weapons:
Why cant we change more parts on weapons, its a very basic system from what i see and it needs to be opened up. For starters reticle, and muzzle.
Mods for vehicles:
Biggest example you can only customize one part of the warthog when you have three areas to customize, the bumper, wheels, front windshield, i think mudflaps to but i might be wrong, point being why not allow us to trick out vehicles fully. Im not to worried about skin vehicles, at this point in time.
This is just about customization which to me is huge as the character you play is a reflection of your imagination, and i think this has been one of the large glaring areas that shouldnt be hard to open up. Plus it can be a huge money maker as well. There are other customizations i have in my head id float out there but im trying to keep it basic as possible.
Im curious what anyone else thinks?