- "You don't have to be Mr. Miyagi. You just have to be Mr. LaRusso."
- ―Amanda LaRusso to Daniel LaRusso[src]
She is played by Courtney Henggeler.
- "Hey, look, we all make mistakes. It's what we do next that counts, right?"
- ―Amanda LaRusso to Robby Keene[src]
She is stern, but also loving and supportive of her family, though she can sometimes butt heads with Daniel's mother, Lucille. She is also Daniel's business partner at LaRusso Auto Group.
She takes a stronger role in the partnership when Daniel turns his attention to running the Miyagi-Do Karate dojo. She fails to see what is fueling Daniel's rivalry with Johnny Lawrence, at one point remarking that the town is big enough for two dojos. As Amanda's first meeting with Johnny is decades after Daniel's encounter, she likely does not know the full story, and dismisses most of it as school hijinks. She also warns Daniel his attitude is spilling over into his professional life. Due to spending so much time at the Miyagi-Do dojo, Daniel has missed multiple business meetings. A key point in friction, but still not yet to a boiling point, comes when Daniel is so fixated on teaching a lesson in a meat locker that he blows off a lunch date with Anoush, one of his best employees. Daniel sees cell phone calls from Amanda and Anoush, but silences them both. When Daniel finally arrives at LaRusso Auto, he is sternly told by Amanda that Anoush has been headhunted away by rival car dealer Tom Cole, and Daniel's no-show at the lunch date was the last straw for Anoush. Amanda warns all this may cost Daniel his business, and ultimately their family's livelihood.
Amanda is the constant voice of reason in the series. She is a very wise, grounded, and practical person, and can de-escalate conflicts with a few well-chosen words. Little is known about Amanda's background. It's possible that her parents are either dead or live far away, as when Amanda tells Aisha that Sam is with her grandmother, Daniel immediately knows she is referring to his mother.
It is also not known how long she and Daniel have been married. Prior to opening LaRusso Auto Group in 2002, she and Daniel had already worked in auto sales together as "Danny and Mandy, the best sales team in the Valley". It is likely that the two have been married since about 2000.
In the Season 2 finale, Amanda takes a tougher stance against Daniel. When Samantha is hospitalized, she threatens to have Tory expelled from West Valley High School. Samantha says her concern is for Miguel Diaz, who is also hospitalized for an undetermined spinal injury. After the doctor diagnoses a broken rib and recommends Samantha undergo X-rays to determine other injuries, Amanda is fed up with all the fighting. She puts her foot down by saying "No more karate!" forcing Daniel to abandon his masterminding of Cobra Kai's demise, as well as have the Miyagi-Do dojo close up shop.