you can on forge and custom games.
i cant play on last resort just like you but diffrent map i dont know
you cant
you cant play as a grunt
you cant its impossible
no you cant
no, it has to be either halo 3 or halo odst and reach might, i dont know but halo 1 cant
you cant unless you have mods
Defiant Map Pack
you cant you can only play as arbiter or master chief
you cant
check family settings
Well in campaign you can play as the arbiter. But you cant play as the arbiter anywhere else.