Yull

Yull was Unggoy stationed on the Rapid Conversion and was part of Dadab's group. He was the first Covenant casualty of the Human-Covenant War. He killed Osmo by tearing his stomach apart, but then was killed by Tartarus.

Yull was less intelligent than average, as was most Unggoy on the ship.

Source

 * Halo: Contact Harvest