Bungie have confirmed the details regarding online co-op in Halo 3 and the truth is that it's probably a lot better than you were initially expecting!
Instead of two player co-op, Bungie have confirmed that four players will be able to join their friends and play through the game. The split screen will be limited to two players per screen though, but as noted you will still be able to join two other friends over Xbox Live or system link.
So who are the four characters that you will be controlling? One will be Master Chief of course, another the Arbiter, and the two new Elite characters are named N’tho ‘Sraom and Usze ‘Taham - all will have the exact same abilities.
Apart from the horrifying network challenges this new mode presented us, were the various gameplay balance issues it adds to the fray. So we got it all together, polished it, and that’s why we’re revealing it now. As a result, you’re going to want to play co-op as hard as you can stomach it. We’d certainly recommend Legendary, but we’ll be revealing some more ways to make the game more interesting and challenging for multiple players in the very near future.Acting as a team is a fantastic new twist to the Campaign gameplay – something that works as well on foot, in close confines as it does on the battlefield, with large scale vehicle mayhem. Scared of Jackal snipers? Send out a scout to see what dangers lie ahead. Terrified of an open field? Flank your enemies and swipe their rides. The combinations and scenarios are endless – and you’ll be able to enjoy them time and time again in Saved Films of your co-op exploits.We mentioned that we’ve been having a blast. We have a lot of stories. Many of them would require that we explain some of the reasons replay will be a big factor, but not quite yet. Soon, we promise.Like every other aspect of Halo 3, this mode is chosen from a Lobby. Simply select Campaign, choose your network (Xbox Live or System Link) and invite your friends to join you, or they can simply join your session once it’s set up and in a lobby (but they cannot join a game once it’s in-progress). They will pop into your lobby instantly, and when you have all the players you need (anywhere from one to four) you can begin the game from the beginning – or from any of your saved checkpoints.
Here's the details on the two new Elite characters:
Name: N’tho ‘Sraom
Affiliation: Fleet of Retribution/Special Warfare Group/Special Operations
History: N’tho ‘Sraom is the youngest member of his Special Operations unit and is one of a growing number of human sympathizers amongst the Sangheili youth. He is a fairly typical young male adult Sangheili—he began compulsory military service at the end of adolescence, and remains unmarried with no close, non-familial relationships outside of his martial order. N’tho Sraom refused to stand idly by while the Prophets replaced Sangheili units with Jiralhanae packs, and now bears deep resentment toward those Sangheili politicians who landed his kind in their current predicament.
Although N’tho ‘Sraom’s romanticized nationalism is emblematic of all Sangheili, he has developed a healthy respect for humanity—not for their physical abilities or martial prowess, but for their audacity and resolve.
Name: Usze ‘Taham
Affiliation: Fleet of Retribution/Special Warfare Group/Fleet Security
History: Although Usze ‘Taham was born into a respected merchant family he was fathered by Toha ‘Sumai—one of the preeminent swordfighters of this age. Usze graduated with honors from the top War College in the Iruiru region of Yermo, Sanghelios (a distinction he shares with Rtas 'Vadum). Shortly after receiving his first post within the Covenant Navy he was offered a place on the Prophets’ Honor Guard but he declined citing “lack of practical experience”. In truth, he had no desire to be part of a largely ceremonial unit, and at the end of his third combat tour, Usze ‘Taham again refused the post—even though his superiors warned him such behavior could be misinterpreted as apostasy.
Since that time Usze has evaded countless punitive actions, at least two assassination attempts, and served with distinction for two additional tours before the Schism. Following the dissolution of the Covenant, he was approached by the Ascetics to become one of their liaisons within the Navy
