Kiiko has blond hair, which is most commonly seen in a braid that runs over her shoulder. She has light brown eyes.
She is often seen wearing her Yamainu uniform in a slightly unique fasion.
Kiiko is strong, dutiful, and extremely loyal. Whenever she is ordered by her superiors, she would obey without hesitation. After Tenka's death she is deeply sad, but still continues her duties, yet Sousei keeps her from doing any assignments because of her emotional state. It is evident that she has feelings for Tenka.
She is childhood friends with him and is also hinted that she has feelings for him. When Tenka 'died' she is deeply sad. In Donten ni Warau Gaiden, She comes with Tenka on his journey.
To Tenka: “…No. I can’t let you go back. You’re not the way you were. Face the truth! Tenka. It’s okay. You have always been shouldering everything alone. You’ve already done enough. Just for once, be good and let others protect you.”
To Tenka: “Good heavens! You know you always get your way with me.”