Nikki Ferris is one of two main protagonists of The Parent Trap II (the other being Mary Grand). She is the daughter of Sharon Ferris, who is divorced, which is why the latter wants to move to New York City. Nikki has to go to summer school and get her grades up to go to some NY school that is attended only by girls. She is portrayed by Carrie Kei Heim.
Nikki Ferris is the first offspring of a predecessor's protagonist to take over as protagonist, the second being Kiara in The Lion King II: Simba's Pride, the third being Melody in The Little Mermaid II: Return to the Sea and the fourth being Jane in Peter Pan: Return to Neverland.