Ijon said Regen is his Unique.The Toxic Avenger wrote: Super Nailgun as unique item? IDK what could be there otherwise.
Might be rather unbalanced though.
Chex Quest 3 seems to be broken, at least playing as SO anyway. The Rapid Zorcher should not be there.

EDIT: Tried a different download, still the exact same problem.
EDIT 2: I came up with concepts for Chief and Arbiter. I'll look into damage scales for Halo 2 and Halo Reach, and adjust their damage values accordingly.
Spoiler: Intentionally retarded writing ahead (Open)mastur cheef has j0in3d t3h wh33l of samara!!1
R0le: l33t sn1p3s
mastur ch33f 1s t3h b3st adn he pwns n00bs, ad nh3 sav3d every1 fr0m fuckign ext1ncshun. n0w in t3h wh33l h3's always pwning b1tches adn fucking there moms lolololol
traits:
HAL0 4 LYFE!!1
every1 noes hal0 1s t3h b3st gaem adn all 0thers suck, tharfore mastur cheef acts liek hal0. N0 gay f1sts just r1ght cl1ck 2 b33t ppl w/ ur gun lol, adn thars grenades that g0 in 1nv3nt0ry liek that f4g w/t3h gr33n r0be has. xcept h3 can has m0re guns now lololol
Sp4rt4ns nevr d13!!1
Ch33f h4s l33t sh31lds but n0 health. h3 g3ts sh0t w/o sh13lds adn he d1es, but h3 cna g0 0ut of t3h fyte adn r33ch4rge.
PRAISE M$!!1
mastur ch33f 1s ub3r l33t 1f j00 pl3h 0n w1nd0ws 0r xbox (Joke trait, that probably couldn't work)
I need to watch more Arby n the Chief/play more Halo for more research on this. Anyway incomplete loadout idea:
Starter: Magnum (No fist because he should be able to do melee attacks with all guns like Halo)
Slot 1: SMG/Dual SMGs and Dual Magnums (Decided Fury would be way OP as Slot I)
Slot 2: Battle Rifle
Slot 3: Shotgun
Slot 4: Assault Rifle
Slot 5: Rocket Launcher
Slot 6: Sniper Rifle
Slot 7: Spartan Laser
Unique: Random Inventory item from Halo 3 (Bubble Shield, Grav Lift, Heal field, Burn field)
Frag Grenades are picked up along with ammo 3 and Plasma Grenades are picked up with ammo 4. The cap on grenades of both types should be 4. I'd focus on Human weapon for the Chief so Arbiter can have Covenant weapons without stealing much from MC (He'd still have the same inventory items; grenades and H3 pickups).
And here's Arbiter's concept:
Role: Assassin? (sorry Strifeguy)
Thel 'Vadam was originally a Kaidon who became Supreme Commander during the Fall of Reach. Failing to protect one of the Halo rings during the events of Halo: Combat Evolved, the Covenant named him a heretic and he was given the Mark of Shame, shortly before becoming Arbiter and being commanded to lead a squad against heretics. Eventually, Thel 'Vadam, along with other Sanghelli, revolted against the Covenant for their misguided belief that activating the Halos would begin ascension into divinity and joined the Humans to stop the Covenant loyalists from destroying all sentient life in the galaxy. After the events of Halo 3, Arbiter returned home. Now, in the Wheel Thel's abilities are continually being pushed in ways neither the Covenant nor UNSC could muster.
Traits:
Active Camo
In Halo 2, Arbiter had camo in place of MC's flashlight. Unlike Master Chief, Arbiter can carry invisibility pickups in his inventory and use them, and they last 1.1 times as long as other characters.
This is our fight, and I will see it finished.
Arbiter shares the "Golden Triangle" combat system with Master Chief and has the same shield/health system as him, except due to his role as Stealth/Assassin, his shield is weaker.
Starter: Plasma Pistol
Slot 1: Second Plasma Pistol, Energy Sword
Slot 2: Covenant Carbine (Ammo 2)
Slot 3: Needler (Ammo 1)
Slot 4: Plasma Rifle (Ammo 4)
Slot 5: Fuel Rod Cannon (Ammo 3)
Slot 6: Beam Rifle (Ammo 4)
Slot 7: Plasma Launcher from Halo Reach (Ammo 4)
Unique: Random Inventory item from Halo 3 (Bubble Shield, Grav Lift, Heal field, Burn field)
Another thing that should change from Halo is that the Plasma Weapons should be reloadable since Arbiter likely knows how they work anyway.