She seldom cries, although she does, though rarely, get upset for various reasons. Nikki can also be mischievous at times. Nikki is apparently closest to her older sister, Dolly, who is currently creating a video diary to assist Nikki as she progresses through life. Many of the Singh family's adventures revolve around Nikki, and cause her three older siblings to be constantly taking care of her. Her older brothers, Rohan and Sunny, are often seen using Nikki for their own benefit, although Rohan shows that he cares about her deeply. However, Sunny seems to dislike Nikki the most although, in some episodes, he is seen being quite fond of her. It is shown that Nikki becomes like Sunny when she grows up.
Nikki is one of the only members of the Singh family that Roli aunty actually doesn't mind having around. Nikki once went up to her house all alone and asked her to play a game with her, to which Roli aunty happily agreed.
Bobby is the fifth child of the Singh family and Nikki's younger brother. Nikki appears to dislike him at first, she always makes excuses to leave Bobby out of everything. She even tried to mail him away by giving him to the postman and putting a stamp on his head, but ended up getting punished.