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Official Site: Sony Pictures

This list of The Karate Kid and Cobra Kai characters reflects fictional characters from The Karate Kid franchise. Josh Heald, Jon Hurwitz, and Hayden Schlossberg define the following works as part of the Miyagi-Verse: The Karate Kid (1984), The Karate Kid Part II (1986), The Karate Kid Part III (1989), The Next Karate Kid (1994), and the Cobra Kai television series (2018–present). However, they state that the 2010 remake exists in an alternate universe. In addition, Jon Hurwitz clarified that the "Karate Kid cartoon is not canon. But there is an Easter Egg from it in Season 3," in response to the question as to whether, "The Karate Kid animated series [is] official within The Karate Kid universe?"

Lucille LaRusso (Randee Heller) is Daniel's mother, Amanda's mother-in-law, and the paternal grandmother of the LaRusso siblings, Samantha and Anthony LaRusso. She is a widow who relocates Daniel from New Jersey to Southern California due to her computer job transfer. It doesn’t seem to have worked out well for her, as she later tells Daniel while working as a waitress she will be on a manager's training program two nights a week and can earn way more than in computers. Although Lucille is a down-to-earth and independent woman, she is greatly concerned about Daniel's harassment from Johnny and his gang, an issue which is shared by Mr. Miyagi. She gets along well with Ali, and in contrast to the formality of Ali's parents, refers to herself as "Lucille" rather than "Mrs. LaRusso." She is a strong influence in Daniel's life and supports Mr. Miyagi's influence in his life.

In the sequel series Cobra Kai, she is shown to initially have a troubled relationship with her daughter-in-law, Amanda, which they resolve through the intervention of Lucille's granddaughter, Samantha. Lucille has fond memories of Mr. Miyagi and his support of her family. She also shares memories of her late husband, Daniel's father, with Daniel when he is having marital difficulties with Amanda.

Bobby Brown (Ron Thomas) is a friend of Johnny and a fellow student at the Cobra Kai dojo. Bobby is Kreese's second-best student and was runner-up to Johnny in the All-Valley Tournament the previous year, though Johnny's most prominent right-hand man appeared to be Dutch. Although one of Johnny's gang (he slide tackles Daniel during soccer tryouts on the first day of school, prompting Daniel to tackle him and land a punch to his face, thus getting Daniel kicked out of the tryouts), Bobby is seen as a more compassionate character than his friends. He tries to stop Johnny from ruining the beach party, stop him from harassing Daniel, and from doing further damage to Daniel during the fight alongside the South Sea apartments during the Halloween party. During the Semi-finals of the tournament, Kreese orders Bobby to put Daniel "out of commission," which Bobby reluctantly attempts to do by landing a kick to Daniel's knee, severely injuring him. After the kick, Bobby drops down and sincerely and profusely apologizes to a pain-ridden Daniel before being pulled off him and disqualified. Because Daniel was unable to continue at that time and Bobby being disqualified, he is the only Cobra Kai member that Daniel doesn't defeat. In the film's novelization, Bobby – remorseful for injuring Daniel and disgusted at not being able to fight him fairly – walks over to Kreese and throws his black belt onto the floor. He then quits Cobra Kai and leaves the arena. In the parking lot confrontation following the tournament, Bobby defends Johnny from an angry Kreese, stating that Johnny has apologized for his performance. When Kreese attacks Johnny, Bobby attempts to intervene but is assaulted by Kreese. After he is saved by Mr. Miyagi, he leaves Cobra Kai for good.

Colonel Dugan has not been a contender in any CBUB matches.