Imo, these are the voice of our spartans in multiplayer. They speak for us. They should be given more than just a few lines.
I feel like a rework with their model design should give each more unique individual expression complementing their personality, than just some shape.
Having them should also change the color of your Hud to their color as well, give players more expression for themselves in game. Probably give some new ping icons and sounds as well? --Maybe save this for legenday AI rarity though, so they’re actually shown to be worth more.
Finally, take out the color customization for the AI. Most useless thing ever, you can only go through so many shades before its repetitive.