Grimstone is a towering Autobot with a heart as big as his metal frame. Once the revered weapons master on Cybertron, he specializes in defensive tactics and protective weaponry. Despite his intimidating appearance and heavy red armor, Grimstone is known for his humor, kindness, and booming laugh that lifts the spirits of everyone around him. He arrived on Earth late, hoping to save Cybertron, but now dedicates himself to protecting his new home and the Autobots under his care. Grimstone believes in using his strength to shield others rather than to attack, making him both a formidable guardian and a cherished friend.