He is the creator of Computron, always feels he is more capable than Optimus Prime to lead the Autobots and the undisputed leader of the Dinobots - Grimlock.
Check out the Hasbro article on Grimlock:
"Fan’s choice nominee #2 is: GRIMLOCK
“Me GRIMLOCK king!”
GRIMLOCK fought his way through the gladiatorial pits underneath Kaon to become one of the greatest warriors on CYBERTRON. Having joined the AUTOBOTS early on during the Great War, GRIMLOCK made it clear he never trusted OPTIMUS PRIME to properly lead the AUTOBOTS. Due to his shock and awe approach to combat, GRIMLOCK is not regarded as a great military leader. However, he has fought and survived through enough battles to earn top ranking position among the AUTOBOTS. Having struck out on his own, GRIMLOCK eventually found himself leader of the DINOBOTS, a special operations strike force unit that can power through most barricades and DECEPTICON strongholds. During a battle with the DECEPTICON SCORPONOK, GRIMLOCK’s vocal processors were damaged, leading to his awkward and distinct way of speaking. If GRIMLOCK has a weakness, it is his larger than Prime ego and his lack of patience.

Check out Hasbro official website here.
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