Niki Walters is a character on DEXTER. She is the daughter of Vince Masuka, who donated sperm in college, resulting in her conception. After the death of her mother, Niki tracks Vince down and the two meet for the first time. Due to some of Niki's behavior, Vince requests Debra Morgan from Elway Investigations to look into her. When Debra discovers that Niki's family currently has a number of outstanding debts, Masuka believes that his suspicions are confirmed. At Jamie's birthday party, he gives her five thousand dollars, but says that's all he can afford for the moment. Niki is deeply offended by Masuka thinking that she tracked him down for money. She doesn't accept the check and storms off.
She and her father soon make amends and begin to have a close relationship. She eventually begins calling him "dad". Vince later discovers that Niki is working at a topless bar. Dissatisfied with having his daughter exploited there, he offers her an intern position at Miami Metro, which she accepts. A while afterwards, Niki comes to a crime scene, while high on marijuana and Vince sends her home and tells her to stop taking drugs, to which she replies that he has the right to control her behavior at work but not at home. The two seem to be having a smooth relationship thus far.