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Demetri Alexopoulos (Gianni Decenzo) is Eli's best friend and a member of Miguel's high school friend group. He is a very sarcastic and underconfident nerd and has a fixed mindset towards physical activities. It is shown that he has feelings for Yasmine, the leader of the popular girls, and jokes that he'd kill Miguel and Eli to be with her. Demetri quits on his first day of Cobra Kai training after Johnny bodyslams him for mouthing off, but he continues to support Miguel. He is shocked and confused about how Hawk's change of style suddenly turned his life around. Hawk explains that it's not him alone changing his style, rather it being this new attitude he's developed, advising Demetri to do the same. Upon hearing this, he attempts to talk to Yasmine, his crush, but it fails. At the end of the tournament, he tells Miguel that he is considering rejoining Cobra Kai.
In Season 2, Demetri attempts to rejoin Cobra Kai, but Kreese punches him in the face after he makes unflattering comments on his arm tattoo and then touches it. As a result, Demetri joins Miyagi-Do, and also posts a negative review of Cobra Kai on Yelp in response to Kreese's actions, earning him Hawk's wrath. He tests Daniel's patience with his whininess, neuroticism and numerous excuses about his weak arms and legs. Demetri struggles to learn the ways of karate but gets a confidence boost after Daniel tells him that he has the gift of anticipation and intelligence, which slightly increases his confidence. During a party at Moon's house, Demetri attempts to reconcile with Hawk, but Hawk responds by dumping his drink on Demetri, already enraged by Moon moving on with another girl. Later in the party, a vengeful Demetri does a public roast of Hawk in front of all of the guests, revealing embarrassing stories from their childhood and outing Hawk as a bedwetter. During the student rumble at school, Demetri initially tries to avoid participating in the fight by summoning a teacher, but when the teacher retreats out of fear of injury, he is reluctantly forced to take on Hawk. After a short fight, Demetri outsmarts an overconfident Hawk by kicking him and sending him crashing backwards into a trophy case.
In Season 3, Demetri's newfound confidence causes his popularity among classmates to rise, and he eventually enters into a romantic relationship with Yasmine. He continues as part of Miyagi-Do and continues to suffer bullying from an increasingly repentant Hawk, with Hawk breaking Demetri's right arm at one point, albeit with some reluctance. When given the chance to break Demetri's arm again during the brawl at the end of the season, Hawk instead comes to his best friend's defense and reconciles with Demetri. Demetri and Hawk then fight side by side against the Cobra Kai students, taking down several together. When a defeated Tory threatens Hawk for abandoning Cobra Kai, Demetri stands up to her in defense of Hawk. Shortly thereafter, Miyagi-Do and Eagle Fang begin training together to take down Cobra Kai and the reconciled Hawk and Demetri stand together.
In Season 4, Demetri continues his relationship with Yasmine as well as his mended friendship with Hawk, being the only one to truly forgive him for his previous actions. When Miyagi-Do and Eagle Fang split, he stays with Miyagi-Do. After Hawk gets his mohawk shaved off by Cobra Kai and loses his confidence, Hawk quits karate due to being depressed about not having his Mohawk to compensate for his cleft lip scar but Demetri insists that he stay and join Miyagi-Do, reassuring him that he will always be his friend, no matter what. In the tournament semi finals, Demetri loses to Robby, but is able put up a fight against him before his defeat, earning him praise from Daniel and the Miyagi-Dos.
In Season 5, Demetri gives Miguel advice on his relationship with Sam. He later joins the Miyagi-Fang students in exposing Terry Silver as a fraud. During the ensuing brawl, Demetri and Eli hack into the Cobra Kai YouTube server, uploading footage of Tory getting Silver to confess he bribed the referee during the All-Valley. He later defeats Kyler as payback for bullying him, the latest of his victims to do so.