Yellow
She spent most of her life worrying about boys with yellow hair. First for the boy who would become her husband, and then the son they would have. It seemed ridiculous. No other hair colour seemed to cause people so much trouble.
Her husband had spent his childhood in trouble. Endless pranks and jokes for the sake of getting peoples attention. it had worked of course, she was testament to that. Later she had worried for different reasons. Could he save them all? Would he be okay after the war?
Their son was different. She worried for reasons that were so similar, yet so different. She worried about his so called rebellious phase when he defaced the monuments. She worried the day he was put on a genin team, then again on the day of his first mission. When she saw him shaking with rage outside his teammates hospital room because 'I should have been faster, then she wouldn't have been hurt'. When she watched him bury his father and refuse the title of Hokage, insisting there were much better choices.
Yes she had spent most of her life worrying about yellow haired idiots, but that was because she loved them.
Bolt, Salada, Himawari, and the other kids are starting to grow on me. They're so cute! I think I'm going to write them from now on. I have head canons for all of them now so yeah.