The Best of HALO SAGA that should be in INFINITE

Considering the best things of all HALO Games. What do you think are the ones that should not be missing in Halo Infinite?
One of these in my opinion is the posibility of use your own character (armor, gender, voice) in campaign, like Reach. Maybe not with Master Chief, but would be cool another option in the campaign where you can be part of the history with your own Spartan. I loved this in Halo Reach and i´m waiting for more like this

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