All objects players can hold/use (vehicles, abilities, and weapons)
Weapons: Assault rifle, sub machine gun (from backyard heroes version of the assault rifle), needle, candle stick I believe it's called (backyard heroes version of the needler), energy sword, sword (backyard heroes version of the energy sword), plasma pistol, wizards wand (backyard heroes version of the plasma pistol), fuelrod cannon (doesn't have a model but does technically exist), rocket launcher, clock work gun (backyard heroes original gun), m60 pistol, plasma grenade (in the files the mega one is the original halo megabloks plasma pistol , the one without parenthesis is the one backyard heroes which had the same name but looked like a bomb with a skull), frag grenade, grenade launcher, battle rifle, carbine, crossbow (backyard heroes version of the carbine), storm rifle, mounted unsc turret, mounted plasma turret, saw. (i could be missing 1 or 2 but that's all I can think about)
Vehicles: warthog (would have different front end pieces like a ram, winch, nothing and I believe something else I'm forgetting), scorpion, another scorpion (unusable but in the files, seems to look more like an actual scorpion but likely used the smaller weirder model as it fit the original megabloks toy more), ghost, mongoose, banshee (likely unusable by player as it can't be spawned in by the givevehicle command), pelican, phantom, vtol, early version of the vtol (it's in the files but can't be spawned in, very similar to the normal vtol but the back fan thing is raised more and has a unsc logo on it), wraith (seems to be the most unfinished vehicle but works), mantis (seems to not have a model only a ui picture of the halo 4 mantis suggesting it was planned to be a vehicle you could make in the garage)
Abilities: (note these seem to depend on spartan type) bubble shield (for green spartan aka chief, seems in the files it was originally going to be like the halo 3 bubble shield with a generator)