Half-Jaw

Summary
''Note: The name itself is fan-speculation. While accepted widely, it is not to be taken as Bungie canon, until such time as confirmed by Bungie.''

"Half-Jaw", as he is known unofficially, for his name is not mentioned in Halo 2 at all, is a White Elite or "Ultra" as Cortana calls those of his rank, a Commander of Covenant SpecOps forces.

He first makes his appearance in The Arbiter, where he leads the SpecOps forces on board a Phantom in reciting an oath of loyalty. He speaks with the Arbiter before the Covenant are deployed to assault the Heretics.

At the start of The Oracle, he mentions that he recognises the stench of the Flood. It is most possible that he is a veteran of the fighting on the first Halo. Later in the level, he hands the Arbiter his Energy Sword, if the Arbiter is not already in possession of one, to cut the cables holding up the facility.

He reappears in the starting cutscene of Sacred Icon, where he expresses his distain of having the Brutes replace the Elites as the Honor Guards to the remaing High Prophets. He reappears in the last part of Sacred Icon, where he is defending an Elite encampment from waves of Flood.

He goes off, but reappears in the cutscene that starts the part of Quarantine Zone called "Shooting Gallery". He and the Arbiter go onto the gondola that leads into the Library of Delta Halo, but goes off to draw some Flood away.

He reappears in the final cutscene of Uprising, where he drives a Wraith and converses with the Arbiter.

In the first cutscene of The Great Journey, he mentions the Scarab as a means of breaking down the door of Delta Halo's Control Room, then goes into the Wraith and fights alongside you against the Brutes.

He is voiced by Robert Davi, who is best known for his role as Franz Sanchez in the James Bond classic "License to Kill".

Images
http://img196.echo.cx/img196/310/arbiternhalfjawtalkingh23zl.th.jpg