Height: 7'2" (in armor)
Weight: 1,000 lbs. (in armor)
Age: Unknown

The only thing that has changed about the Master Chief between Halo & Halo 2 is that his armor has been upgraded to the MJOLNIR Mk. VI self-contained battle suit. The new suit has an improved HUD and several other features but most improtantly has the capability of monitoring two weapons simultaneously greatly expanding the chief's capabilities.

Once again, nothing has really changed for Cortana between Halo & Halo 2.

Commander Miranda Keyes is a newcomer in Halo 2, daughter of war hero Captain Jacob Keyes, she is the commanding officer aboard In Amber Clad, not much is known about Cmd Keyes.

Seargeant Avery Johnson, this little trickster somehow made it back to Earth at the end of Halo. There isn't much that can be said about Sergeant Johnson, other than "He knows what the ladies like."

Fleet Admiral Hood is the Commanding Officer of the UNSC forces in Halo 2. Other than that, not much is known about this semi-mysterious character.

The Arbiter was once the Supreme Commander of the Covenant fleet, until Master Chief destroyed the first Halo, that is. After which he was taken back to High Charity and was convicted of heresy. After being branded with the mark of shame he was asked to becom the Prophet's Arbiter (Holy Warrior.)

Tartarus is the Chieftain of the Brutes and is easily the most recognizable of the Brutes as he is the only one with a white beard and mohawk.

Truth
(Mercy and Regret Unavailable)

The three high prophets of the Covenant are Truth, Mercy, and Regret. They for the major power of the Covenant and their word is law.