Yona

Age: 16
The spoiled princess of the Kouka kingdom, who has a crush on her cousin and childhood friend Soo-won. Soo-won comforted her when she lost her mother in young age. She hates her crimson red hair. Her bodyguard is the other childhood friend, the general Son Hak who she finds really annoying.
After Soo-won kills her father in front of her eyes in order of becoming the new king, she has to run from the castle with Son Hak.
She is the red dragon.