Grimlock is the most fearsome and powerful member of the Dinobots. Grimlock can be cold, merciless, and contemptuous of those he considers beneath him, such as human beings, and at times, even Autobot leader Optimus Prime himself, who Grimlock would gladly supplant as Autobot leader if he were able to, giving him a superiority complex. Nevertheless, he is a valiant warrior whose actions command respect from all who are witness to them, both friend and foe. One of his most distinguishing features is his famous speech impediment, which leads him to shorten sentences and refer to himself constantly as "Me Grimlock," never "I" (e.g. "Me Grimlock no bozo! Me KING!").