Kayano is a character from the anime Mecha-Ude, where she serves as a member of ARMS, an organization dedicated to rescuing mechanical arms from exploitation. She is among the oldest members of the group and was a classmate of another member named Oyama.

Despite her age of 19, Kayano possesses a strikingly youthful appearance that often leads others to mistake her for an elementary school student. Her small stature, listed at 133 cm tall, contributes to this perception. She was born on May 25. A notable aspect of her background is that she was born with a naturally weak and frail body. To overcome this physical limitation and maintain her strength, she relies on a process known as "Derive," which is a deep synchronization or binding with her mechanical arm.

Kayano is a skilled information warfare specialist, preferring intelligence gathering and strategic combat over direct confrontation. She is often seen pursuing the character Alma, whom she refers to as the Trigger Arm, indicating a specific and driven motivation related to this target.

In action, Kayano wields a serpentine, worm-type Mecha-Ude named Ouroboros. This mechanical arm is capable of a technique described as pseudo-free transformation, granting her versatile and adaptive abilities in the field. Her role within the ARMS organization is that of an experienced fighter and operative, whose tactical skills in information handling are as crucial as her combat capabilities.