This is an awesome idea!
List of feature they should have:
-Four voices to choose from, two male two female.
-Gives you actual useful info in battle like: The rocket lancher dropped in the south east corner or You are out numbered 3 to 1 i recomend calling for reinforcements or get out of there.
-Useful info for improving your game like you need to reload more often, it leaves you at a disadvantage.
-Maybe an armor mod that gives you a sensor for your AI to use to detect hologram deployment or vehicle heading your way.
Halo 5 baby