This fanfic takes place after Halo 2, the Covenant have split up. The Elites, Grunts, and Hunters are now helping the humans.
The main characters are:

Spartan 218: Gus
A Grunt named Jubjub (Jube-Jube)
An Elite named Yayan
And 2 Hunters named Ying and Uta

Gus and his Covenant friends are on a mission to track down Truth, right now, they are on a Covie Warship called The Renegade, Truth was last seen on this ship.
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Chapter 1: Truth

"Open fire!"
Gus took out his Battle Rifle. A plasma grenade flew past Gus's helmet and landed behind him. He ducked, rolled and opened fire on a Brute with an energy sword. Ying and Uta were concentrating on using their cannons to destroy the Plasma Turrets on the landing above them while Jubjub and Yayan protected the Marines. A Drone tried to flank Gus and was shot in the head with his rifle. Gus switched to dual SMGs and concentrated on the flood jumping down from the platforms above him. JubJub and Yayan retreated and threw grenades into the halways.
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Ill post more tommorow, right now Im a little tired.

Interesting idea.I'd like to see more.