I support. Here's the half-moveset that I like so far:
Weight: Slightly less than Dedede
Jump Height: Same as Zero Suit
Falling/jumping speed is the same, it's pretty slow. Chief is almost floaty, but he weight a ton.
Double jumps: 1. A slight boost from the booster.
Passive Effect: MJOLNIR Armor: Chief only takes 85% of the damage he would normally take while MJOLNIR is in effect. After taking 20%, MJOLNIR will break. Chief will then take normal damage from energy-based attacks but 115% of physical attacks. After 5 seconds of not taking damage, MJOLNIR will begin to recharge. It takes 3 seconds for it to fully recharge. It won't recharge if Chief is running. In fact, Chief takes an additional 5% of damage and knockback while he's running if he doesn't have MJOLNIR, which adds up to 120% extra damage if it's a physical attack.
B: Magnum Shot. Kind of like Bayo's B, but straight direction, londer range, but only 1 bullet at a time. Can be angled by holding B and moving L stick. Can lock.
Side B: Plasma Grenade (Yes it's sticky, but detonates a second after and can't be exchanged on touch). Kind of like Mega Man's side B but it's thrown in an arc, and always remains constant. If it doesn't hit a player and hits a surface it will stick to the surface and detonate moments later.
Down B: Armor lock from Halo reach. Slow and punishable, but while he's using it he takes only 80% of damage, can't be grabbed and experiences no knockback. He can't hold it for more than 8 seconds. After that, he must wait 10 seconds before using it again. Can't use it while airborne.
Up B: Jetpack, also from Reach. Once he uses it, it's constant but can press B again to cancel it. It does not put Chief in free fall at all, and during his ascent he can press A to shoot an assault rifle.
Jab: a three hit combo. A punch like the melee button from Halo games, then a kick, then Chief smacks them with the underside of an assault rifle.
Side tilt: Shoots an AR. Fires up to 32 shots, each dealing 0.8%. Then he stops and reloads.
Up tilt: A single upward slice with an Energy Sword. Fast, repeatable, and maybe a combo piece.
Down tilt: A slow kick. Kind of like Ganon's upsmasH: Slow, but little end lag. He presses his foot downward, and anyone hit will be grounded.
Dash attack: Spartan charge. Cheif only takes 85% of damage that he would normally take while in the animation. The hitbox comes out early, but it has a good amount of end lag.
Neutral Air: Same as mega Man's, he shoots an SMG. Each shot only deals 0.6%, but it fires very fast. Chief can actually angle the shots using L stick. Pressing down while holding A won't put him into fast fall.
Forward air: A swing with the energy sword.High damage, low knockback. Consist of two hitboxes, one for most of the body and one at the tip. The one at the tip has no different properties, but it can lock.
Up air: A weak upwards punch. This can actually lock if the person being hit is on a platform (battlefield, Dream land, etc).
Back air: A swift kick backwards. Same properties of ZSS, Fox, etc.
Down air: Ground pound. Slow and lot's of end lag. Chief remains suspended in the air for a moment while the player inputs a direction. Chief will then launch himself in that direction. If he lands on any surface, he will create a massive hitbox that deals loads of damage and knockback, and easily breaks shields. If he does not hit a surface and remains airborne for it's entirety, Chief will cover a great deal of space in the animation. For it's entirety, the hitbox does remain while chief is in the air, and will not stop him from descending. The hitbox grows weaker every 30 frames. Chief cannot angle himself upward or sideways with this, making it a bad recovery option.
F smash: Shotgun blast. The hitbox angles outward away from chief but only for so long before the bullets dissipate. If close to Chief this will break shields. The bullets scatter in different angles fast. Fast to use, medium endlag (has to do the *k-chk* animation).
U smash: An upwards swing with an energy sword. High damage, little knockback. Enough end lag that it cannot be repeated, and the player hit is in tumble for a very short time.
D smash: A swing with a gravity hammer. Think of Dedede's forward smash: first the hammer is above him, then on the ground. It deals a lot of damage, and with a little charge will break shields. The hitbox does not go behind chief but extends a nice amount in front of him (gravity shock). Players hit by the hammer as he swings it are launched at a normal arc. However, if hit when the gravity shock begins, they'll be launched completely upward, like Corrin's counter. It's fast, but has a ton of end lag.
Ledge get up attack: A simple, weak-ish boot with his leg.
Get up attack: Chief does a 180, sticking one leg out and the opposite arm out with an energy sword in hand. Players hit by the sword get launched upward-ish, but players hit by his leg are launched at the "Sakurai angle."
Up taunt: "I need a weapon."
Side taunt: he holds out his hand and Cortana appears in it. She waves at anyone in front of Chief then disappears.
Down taunt: "BOO!" (From Halo 2)
Victory 1: Simply walks up and stares outward, like his pose from the cover of Halo 3.
Victory 2: He seems to be having a conversation with Cortana before she disappears.
Victory 3: He kneels downward and looks up, saying "You will be remembered." (References Sgt. Johnson, Noble team, and anyone else who's died in the Halo story).
Special victories:
Against Samus: Says, "The best soldiers come from UNSC."
Against Snake: Says, "Try wearing some armor."