Demetri Alexopoulos is one of the two tritagonists in the Netflix series Cobra Kai. He is portrayed by Gianni Decenzo. After being the victim of bullying for years, Demetri joined Cobra Kai Dojo alongside his friend Eli, though Demetri left after disagreeing with the dojo's ethics. He later joined Miyagi-Do Karate in the hopes of learning self-defense. He often serves as the moral compass of the group, believing that violence should be a last resort.