Why does Emika dye her hair in a rainbow of colors in the novel, Warcross?

Emika dyes her hair in rainbow colors in order to pay tribute to her father. Since her father passed away when Emika was very young, her dyed hair is a symbol of her love for him. It also symbolizes that he is always with Emika, that she will never forget him, and that everything she does is to make him proud. Emika's father, more than anyone else, had the largest role in shaping the person who she is today.