Samantha LaRusso

Sam is a smart, moral person who stands against bullying. She dumps her boyfriend Kyler for bullying and later forms a relationship with Miguel. After a misunderstanding, she dumps Miguel and becomes friends with Robby. Sam joins Miyagi-Do Karate, where she develops feelings for Robby, but still has feelings for Miguel. A drunken kiss between them leads to a school brawl, causing Sam to feel guilty. She quits karate after a traumatizing fight with rival Tory, but returns after encouragement from Daniel. Sam's relationship with Robby ends when he attacks Miguel, and she rekindles her relationship with Miguel.

Throughout the series, Sam struggles with following her father's footsteps and eventually decides to follow Johnny's teachings instead. She develops an impulsive nature, often instigating fights with Tory. In the tournament, Sam loses to Tory, feeling guilty for her loss and the potential closure of Miyagi-Do. She breaks up with Miguel to focus on herself and helps her father regain confidence. Sam trains extensively for the Sekai Taikai exhibition fight and forgives Tory, reconciling with Miguel.

At the Sekai Taikai, Sam and Miguel take a break. During this time, Sam notices Narrator's impressive skills during training and decides to approach Narrator for a greeting.