From Halopedia, the Halo wiki
Linglin was an Unggoy soldier of the Covenant. He was not particularly intelligent, and followed the Grunt saying, "When in doubt, shoot." In the 9th Age of Reclamation, he was stationed on Installation 04 as an infantry unit of the Fleet of Particular Justice.
During Zuka 'Zamamee and Yayap's first attempt to kill the Master Chief, he was under the command of Yayap. As 'Zamamee sent two Hunters to surprise the Chief near the security center of the Silent Cartographer, Linglin ran in and fired an overcharged bolt from his Plasma Pistol in the general direction of the Chief. It was a stupid thing to do, since there was no clear shot. The bolt struck one of the Hunters in the back, killing it, which then made the Hunter fall over and crash into his bond brother, leaving only one injured Hunter for the Master Chief to deal with as opposed to a fearsome pair.
Because of his mistake, the Chief was able to overcome the lone Hunter. Linglin was shot and killed by the Chief as he tried to run away, terrified at the outcome of his foolish actions. Yayap, standing nearby, felt blood spray his face and then 'Zamamee yanked him into a cargo pod where they hid and survived the catastrophic event.
The name is perhaps a reference to "Ling-Ling", a dog whose head is needed by Bungie in their quest to rule the world - an ongoing joke of theirs. Linglin's decapitation is also possibly a Ling-Ling reference.
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