|Full Name||Kuroba Ayako|
|School||Fourth High School|
|Year/Course||Year 1 - 2096|
|Novel||Volume 8, Chapter 4|
|Audio Drama||Yōko Hikasa (Audio Drama)|
Ayako likes to tease her twin brother about his affection towards Tatsuya, choosing to word things in a way that would normally cause misunderstandings.
However, it appears that the two of them get along well. Ayako and Fumiya are usually paired up in gathering information on various things.
Ayako appears to hold a close, yet professional, relationship with Tatsuya. She is one of the few Yotsuba family members who does not look down on him, and appears to be one of his main sources of information.
During the Reminiscence volume, she had shown Tsundere traits of admiring Tatsuya, but it is unknown whether these feelings have changed since then.
She has been hinted to have strong feelings for him, believing that he is always protecting her and feeling gratitude to him for teaching her how to use her innate magic and therefore allowing her to establish herself as a great Magician. As such she has never looked down on him as a mere Guardian. She also overestimates his abilities.
In Yotsuba Inheritance volume, Ayako walked out from the family gathering after Maya announced the engagement between Tatsuya and Miyuki.
She suspects that Maya is using Miyuki to free Tatsuya as guardian.
Ayako feels intense rivalry towards Miyuki for unstated reasons but the reasons somehow fathomable and can be guessed easily based on their circumference.
In the Steeplecross Arc, -as Miyuki feels jealous easily when it came to her brother,- she dislikes the fact that Ayako's ability for gathering information can help her brother unlike her power that is great only for supression. Ayako seems delighted after flaunting about that to Miyuki.
It seems that Tatsuya is rather involved in their rivalry as one of the many still unstated reasons.