Nicole Swan, elder sister Bella Swan, comes to Forks a year before her sister, she never liked Phil, and always liked Charlie and loved the rainy cold weather, in Phoenix she was a normal teenage girl while in Forks she's a vampire's mate.
Nikki was always Charlie's favorite while Bella was Renee's favorite, meanwhile Phil and Nikki pretended to get along for Renee's sake, but when she wasn't around they would each be in their corner of the house.
When Nikki moves, Nikki is ecstatic while Bella is grumpy because she will lose her sister, the girls are the complete opposite of each other, seeing that while Bella loves the sun and warm atmosphere, has low taste for fashion, hates the cold and rain and doesn't have a stable relationship with Charlie while Nikki loves the cold and rainy atmosphere, has a lot of taste for fashion, hates the sun and warm atmosphere and doesn't have a stable relationship with Renee and especially not Phil.