Cowardly Grunt
From Halopedia, the Halo wiki
Summary
In the Halo 2 level Uprising, in the first room after the cavern, there is a lone Grunt hiding in a corner, trembling with fear. If you approach him, he will say, "Please, no hurt! Me like Elites. Brutes stinky bad bad. Me stay here, make sure no Brutes come behind mighty Arbiter. Heh, heh... Eh?" (listen) He will not follow you, and if you push him to a battle, he will not fight. He also dies with only one shot.
