Kushina was born as the twin sister of Minato.
She was born on the night of the Nine-Tailed Demon Fox's Attack just like Naruto Uzumaki and Minato. As a Genin, she was in her parent's squad, Team Miori.
Kushina was a sweet and hardworking individual like her mother. She was very good at calming her younger siblings when they got upset.
Kushina was very skilled with fire nature justu.
As a Jinchūriki of Honō, she is able to manipulate fire and have extreme speed but the consequence is torn muscles.