No. In some missions, you get to play as the Arbiter, who is an Elite. The other missions are played as Master Chief.
Yes, you play as the Arbiter in certain halo 2 campaign levels. I believe there are mods too. You can also select Elita as a character model in halo 2 multiplayer.
EDITING... From Tony: you have to be 2nd player in campaign
http://www.moddb.com/mods/elite-campaign
Yes, you can, but not in the campaign. Only in custom games, matchmaking, ect.
Thats a general.
yes
Finish the Halo 2 single player campaign.
It is not like the multiplayer map pack. Halo 3 Recon is a new game that depicts a new campaign as an elite ODST unit during the events of both Halo 2 and 3.
Be player 2 in the halo 3 co-op campaign. Or, play the Arbiter levels in halo 2.
Yes
no. there is only human skulls on the campaign levels but there might be some on the mythic map packs.
yes