From Halopedia, the Halo wiki
Along with Tukduk, Guff was essentially a toady of Flim's. He and Turduk were assigned to Flim's post on the Tiara, orbiting Harvest. The three had a rocky relationship with Dadab, Rapid Conversion's Deacon, during their time on the Tiara. Later, Guff, Flim and Turduk were raiding human containers in the Tiara, looking for food and Forerunner artifacts. Guff showed the others how to open the containers, and later complained that they never contained anything useful.
During the First Battle of Harvest Tukduk, Guff and Flim were among the last surviving Unggoy when the Tiara was stormed by UNSC forces. During the firefight, Guff was able to wound Colonial Militia recruit Dass, but before he could finish him off, he was killed by Staff Sergeant Johnson.
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