Let me start by saying the fact your AIs can have personalities is a great idea. Im ecstatic to see what the 343 team is going to do with this concept because of how much potential has just been injected into the game.
As the Title says add more for the AI. This is more of a failing Destiny had where “Ghosts” were a neat concept but became nothing more than a cosmetic slot. It would pain me to see the same thing happen to halo infinite AI. So i suggest have AI react to not only ingame events but things like time or gamemode, Maybe have the AI talk to themselves when you are AFK and do some kind of “Oh your back want to play a game?” kind of line. This would make the AI feel much more a partner and not something to being used to pad a battlepass. Now I understand not everyone wants an AI that speaks every 3 seconds so i think a slider from silent to chatterbox would negate this problem entirely. This system has been done before in DOTA2 (Dota 2: Store - Announcer - Deus Ex - YouTube) and its amazing, however its on a PC only game I honestly think Halo infinite AI is a sleeper feature that most are skipping over because it hasn’t been expanded to the degree it deserves.
I really just do not want this feature to be underutilized like it was with destiny and i see great steps towards it being better already so heres hoping, fingers crossed that you take my suggestion into consideration and spend some time with the bits of code that are suppose to be are partners in the field.