First, lets divide up the multiplayer: Matchmaking (need to think of a better name), and Infinity
The Matchmaking section would be competitive multiplayer, and would have the following features:
-Sprint disabled
-No loadouts
-No armour abilities
-No equipment (?)
-Skill based ranking system (1-50, Recruit [1 rank], Private - Lt Colonel [3 ranks each], Colonel [1 rank] )
-no ordinance
It would contain the following playlists:
-Arena/Rumble Pit/Lone Wolves
-Team Slayer
-Big Team Slayer
-Team Objective
-Team Snipers
-Team Doubles
The Infinity Section would be social/casual playlists (War Games), Spartan Ops (continuing story, possibly open world), Firefight (Covenant, Sangheli, Flood, Promethean)
It would have these features:
-Sprint enabled
-Personalised Loadouts (in certain gametypes)
-Armour Abilities and Equipment (available in loadouts)
-Ordinance in some gametypes
It would contain the following playlists (some ranked as they currently are, dont contribute to competitive ranking):
-Infinity Rumble (ranked)
-Infinity Slayer (ranked)
-Big Team Infinity (ranked)
-Big Team Skirmish (ranked)
-Infinity War (32 v 32)
-SWAT (ranked)
-Action Sack
-Grifball/Ricochet
-Flood/Infection
Some other features could include:
-Dual wielding (in both Competitive and Infinity)
-Ability to play as Elites in Casual (different hitboxes make them unsuitable for competitive)
-possible Marine/ODST gametype, plays similar to Battlefield (Will detail below)
-Armour customisation a mix of Halo 3, 4 and Reach (choose undersuit and then what armour components go over it)
-Certain Armour skins carry over between different suits and components
-Weapon skins unlockable through mastery commendations and specialisations
UNSC Firefight section:
Basically you would play as a UNSC Marine, Army Trooper or ODST. You would make a character for each (similar to Mass Effect - Gender, Face, Uniform) and create specific class loadouts for each. You would have your regular Rifleman (AR or BR, carries Biofoam canisters), Engineer (SMG, carries equipment that can repair vehicles up to a certain point), Marksman (DMR). Each loadout would also come with a certain type of Magnum, Marines with M6H, ODSTs with M6C/SOCOM, Army with M6G or M6J/C.
Basic gameplay would be similar to firefight, with a team of soldiers (4-16) being dropped off in a certain way (Army by Falcon, Marines by Pelican and ODSTs by Drop Pod) and having to defend and secure the area against a particular enemy (Flood, Prometheans, Covenant, Brutes, Insurrectionists), in a similar way to Mass Effects multiplayer
BASIC PLAYER TRAITS
-H3 ODST movement speed, but can sprint
-lower jump height, can climb up objects in a similar manner to Light and Medium build characters in Brink
-cannot dual wield
-Still no ADS (this isn’t COD)
-being hit causes player to bleed, although plasma weapons sear the wound
-Health doesnt regenerate, need to find biofoam canisters or have a medic nearby to stop bleeding
-Helmets actually work, from certain angles the helmets deflect shots
-Body armour protects against projectile impacts from certain angles
-Plasma weapons are extremely effective against players
-Different Character types have different HUDs
-The model of each weapon depends on which character you choose (Marine/ODST AR is MA5D, while Army is MA37 ?)
Maybe even add a regular multiplayer mode for Marines vs Insurrectionists?