It would be awesome to see a mode where its the banished vs humans so we can never have a mirror matchup or face our own people. This mode wouldnt need to be ranked and would be more for fun and being immersed in the halo universe with real faction wars.
Also add some voice lines to targeting or being attacked by your own faction or the enemies.
I got to be the color green yesterday and it was the best. Let us customize our army color or even put the option to show default color like in halo wars 1.
This games the best, just a few ideas to make it even better.