Playable characters during campaign

I want to have split sections like Halo 2 and Halo 3: ODST where we play as different characters. I have no idea of Halo 5’s plot, but I would like to play as the Arbiter from time to time. I want Chief levels and Arbiter levels. Also, I want brutes back as enemies in some form and the Arbiter levels would give us a reason to fight them.

I also have been wondering how co-op should work. Do you think they should just clone the main characters or do something like Halo 3 where the other players are regular elites? I liked playing with unique elites in co-op, but I’m not sure who would fit that role for Chief’s missions.

Yep. Definitely something like this. Maybe even allow us to play as Brutes, or different members of Blue Team if they even make it into the campaign. How about even tell us the whereabouts of Buck and the gang while they’re at it?