Mirai is a human character who serves as a park guide at Japari Park, the central setting of the Kemono Friends franchise. She is frequently referred to by her occupation as Guide-san. Her appearance is characterized by long green hair, blue eyes, and glasses, and she wears the official Japari Park uniform, which includes a pith helmet adorned with two feathers. As a park guide, her primary responsibility is to escort visitors around the park and to look after the Friends, the anthropomorphic animal beings that inhabit the park.

Her background includes a formative meeting with another human named Kako at a zoo several years before the main events of the franchise, and the two developed a close friendship. Mirai is depicted as a dedicated and knowledgeable guide who takes her duties seriously, measuring Friends' physical condition and occasionally entrusting tasks to other caretakers such as Nana. Her motivations center on ensuring the safety and enjoyment of both visitors and Friends, as well as maintaining the proper functioning of the park.

In the original Nexon mobile game, Mirai assists the player in battling the Ceruleans, hostile amorphous creatures that threaten the park. In the first anime season, which takes place after the mobile game, she appears only through pre-recorded video messages projected by the Lucky Beast, a robotic guide. These recordings serve as valuable sources of information for the protagonist Kaban, providing clues about the park's history and the nature of the Cerulean threat. Though she does not appear in person during the anime's main storyline, her recorded presence plays a key role in helping Kaban and her friends understand the threat of the black Cerulean and formulate a plan to stop it.

Mirai maintains a close relationship with Kako, and through her work she interacts positively with many Friends. Her development as a character is largely implied through her recorded messages and her consistent role across different entries in the franchise; she remains a steady, reliable figure whose recorded guidance continues to assist others even when she is no longer present. Her notable abilities include thorough knowledge of Japari Park's geography, facilities, and Friends, as well as the capacity to coordinate activities and relay critical information through technological means. As a human without superhuman abilities, her strength lies in her expertise, her organizational skills, and her compassionate dedication to the park and its inhabitants.