You can pick 1 thing from each game to bring forward to Halo Infinite. What are you bringing?
I choose:
Halo 1: the iconic 3 shot magnum
Halo 2: infinite ammo energy sword
Halo 3: playing on the Ark (that ocean side forrested utopia feeling)
Halo 3: ODST: the perfect match between the music and atmosphere
Halo Reach: the dark and gritty art style
Halo 4: calling in ordinance
Halo 5: advanced mobility
CE: mystery
2: campaign length
3: epic large scale battles
3 ODST: dark atmosphere
Reach: feeling like you’re fighting a losing battle
4: EPIC STORY TELLING
5: blue team
H1: Have to agree with medicvs; mystery
H2: Melodrama
H3: Community
ODST: Firefight
Reach: User Interface
H4: Chief being a real character
H5: Advanced Mobility aka Spartan Abilities
Flaming recon 
CE: Campaign presentation (and it seems like we already getting that so PARTY 
)
H2: Boss fights (I like them sue me)
H3: Large scale engagements
ODST: Exploration
Reach: Armory
H4: Storytelling
H5: Blue Team
> 2582197822075686;5:
> H2: Boss fights (I like them sue me)
I’m gonna need your lawyer’s contact info.
CE: Warthog physics
2: dual wielding
3: music
ODST: firefight
Wars: Red team
Reach: customization
4: narrative
S. Assault: mini campaign
S. Strike: needler mines
5: vehicle seat switching
Wars 2: Flood
F. Raven: ODST humor
CE: making the world feel bigger than it is
2: the art style
3: Duel wielding
4: story telling
5: custom games browser
Reach: heath packs
ODST: firefight
Wars 1: The super sentinel
Wars 2: the flood
CE: Large open levels
2: Hitscan BR
3: Equipment
ODST: atmosphere and music
Reach: Invasion!
4: Nothing. Trash game.
5: 60 fps
CE - The Zooming style system
2 - Great memorable lines!!! (There’s so many!)
3 - Equipment
ODST - ODST style Firefight baby!!!
Reach - The UI
4 - The Sticky Detonator
5 - The perrrrrrfect medal/how he says it 
H2A - MP maps that have Interactive environments
I know H2A is H2 but the MP is different, so felt I had to mention it 
Halo CE: Exploration
Halo 2: Dual Wielding
Halo 3: Rank System
Reach: UI
Halo 4: Dominion, Richochet
Halo 5: Thruster
hce: snowy environments. the good kind with pine trees and a mysterious night or dark blue sky.
h2: h2 carbine is best carbine
h3: the physics. especially regarding the vehicles but the physics in general is what made the multiplayer so fun.
h4: spartan ops, or some other short mini mission filled bonus campaign
h5: warzone
reach: cosmetics
odst: the pistol, it sounds cooler than the h5 tactical magnum.
hw: blurr making the cinematic cutscenes
hw2: the banished
CE : Music
2 : Campaign
3 : Multiplayers game modes
4 : spartan Ops
5 : forge
ODST: Firefight
reach: cosmetic
Halo 1: atmosphere
Halo 2: that perfect BR
Halo 3: brutes
Halo 3 ODST: pacing
Halo Reach: armour customization
Halo 4: character development
Halo 5: thrusters
Halo Wars: red team
Halo Wars 2: art style (not the graphics but the design of armour and vehicles, etc.)
Honourable mention: MCC: match composer
CE: mystery and wonder
2: storytelling and multiplayer
3: epicness and big scale battles
3 ODST: Halo Infinite ODST stand alone DLC
Reach: armour customization
4: nothing
5: 60 FPS
CE: The sense of mystery in the Campaign
2: Dual Wielding
3: The epic set pieces from the campaign
ODST: Exploration
Reach: UI
4: Narrative
5: Forge and Customs (That’s two, I cheated).
Walking with the left stick and aiming with the right from Halo 1.
CE: classic CE Marines
H2: locations (gorgeous landscapes and incredible areas in the campaign)
H2A: everything (visuals were spectacular, best audio of the series (ie: listen to the AR in multiplayer, its beautiful), the campaign elites, no fall damage, damage output of weapons, over-all gameplay was the best)
H3: color pattern of armor
Reach: in-depth customization (no armor affects!)
H4: Spartan Ops
H5: Forge and Seeker Helmet (I cheated, I had to put both)
Halo CE: Open Environment (Accompanied by Wonder and Mystery)
Halo 2: Halo 2’s BR
Halo 3: Friendship between Master Chief and the Arbiter
Halo Reach: Art Style
Halo 4: -Yoink!- Cortana
Halo 5: Smooth Framerate / Gameplay
CE: Flood theme music
2: Marine AI that actually kills things
3: The Ark
ODST: Exploration and open world
Reach: Highlands remake and unique weapon medals.
4: Mammoth and Lich fighting
5: Movement options
Wars 1: Vampire and Cobra
Wars 2: Any trace of the Banished