Agent Stone is a human character from the live-action Sonic the Hedgehog film series, serving as the dedicated personal assistant and loyal right-hand man to the primary antagonist, Dr. Robotnik. He is a government agent originally assigned to work alongside Robotnik. Stone has a slim build, short slicked-back black hair, brown eyes, and a neatly trimmed beard, typically wearing a black suit with a navy or black shirt and black tie. His defining trait is his unwavering loyalty and deep admiration for Robotnik, enduring verbal abuse and humiliation without complaint. Despite Robotnik’s contempt for most people, Stone genuinely cares for him, a devotion expressed most famously through his skill as an expert barista who prepares elaborate lattes with steamed Austrian goat milk. Stone is calm and professional but can be as ruthless as his master, willing to use advanced technology and Badnik drones against anyone who crosses him. His primary motivation is serving Robotnik and helping him achieve his goals. When Robotnik is banished to the Mushroom Planet, Stone follows a contingency plan, takes over a coffee shop from its owner, renames it the Mean Bean Coffee Café, and works as a barista while awaiting his return. Upon Robotnik’s return, Stone rejoins him, helps establish a secret base, and acts as co-pilot of the Giant Eggman Robot. After Robotnik’s later defeat, Stone evades capture by disguising himself as a soldier. He is technically competent, skilled with machinery and infiltration, and capable of operating advanced weapon systems. Over time, Stone evolves from a subservient assistant into a more proactive and resourceful villain, with Robotnik ultimately acknowledging him as a true friend.