I hope Bungie answers some questions in todays weekly update.
We know that the Arbiter is walking around with the Chief in some levels and that he has a green co-op marker above his head which clearly means he is different than your usual marine.
Just how complex will his AI be?
Will he pick up different weapons like a second player, will he deploy equipment and most importantly, will he be able to die?
I hated the immortality of important characters in Halo 2. We can't kill them, fine, but Bungie please don't put them into encounters.
I'm talking about Johnson and Half-Jaw here, just give them a pistol and watch how they kill everything in their path in Halo 2, that isn't cool. Dumb ass Needler Keyes from the first game wasn't that hot either, but better than immortal allies.
I hope the Arbiter is NOT invincible and I hope that it doesn't feel like an escort mission either when he is around. Just give him better aim and more health, make him smart or make him a coward, but please don't ruin your carefully crafted encounters again with invicible characters.