Nicole is an alter ego of Nicki Minaj who appeared for the first time in an interview between her and Nicki. She is portrayed as a very sweet and girly interviewer with a valley girl accent.
Ever since Nicole's first appearance, Nicki has been sporting the infamous Nicole wigs in videos such as "I'm Out," "Love More," and "High School."
Some Barbz/Kenz/Boyz believe Nicole is an alter ego Minaj has been portraying this year. It is likely that Minaj stopped using her as she no longer wears wigs since 2015.