Nikki

Nikki is a character in elements and visions.

Childhood
Nikki and Hiro's parents disappeared of unkown reason, so around her young years she spent her time with her grandparents for her whole childhood. around before season 4 happend, Nikki left her home and went out to explore until she meant the brotherhood.

Elements
During elements, Nikki meant brotherhood.

Visions
During Visions, Nikki tries to take care of her little brother Hiro so he doesn't get hurt or even worse. However by now she's Jack's apprentince in training.

Trivia

 * Nikki is the one of the only three characters who were taken from Icecry's comics (The others being Hiro and the Old Man.)
 * Hiro was originally going to be her son like in Icecry's comics but it was scrapped because Drender thought he would be better as a Younger Brother.