Description
Fenneko is an anthropomorphic fennec fox working as an office employee in the accounting department at Carrier Man Trading Co., Ltd., alongside Retsuko. Her light fawn fur features a distinct dark fawn triangular stripe on her forehead. At work, she wears a navy blue vest and matching skirt, a white dress shirt, and brown heels. Outside of work, her attire is a baby blue turtleneck sweater, gray skirt, black tights, and brown boots.

Quiet and highly perceptive, Fenneko deduces co-workers' thoughts and emotional states by observing their mannerisms and social media activity, identifying herself as a professional social media stalker. Though usually accurate, she becomes unsettled by potential errors. She maintains a cynical and judgmental outlook, voicing blunt or hurtful opinions without hesitation, such as advising Haida to give up on Retsuko after rejection.

Fenneko demonstrates complex friendship dynamics. She shows loyalty and protectiveness towards Retsuko, expressing anger at unfair treatment and vocalizing Retsuko's unspoken workplace frustrations. She acts as Haida's confidante and drinking buddy, aware of his crush on Retsuko and initially attempting to shield Retsuko to aid him. However, she sometimes crosses boundaries, like exposing Haida's family background without consent or sending private evidence to Retsuko against his wishes. Her relationship with Tsunoda starts with mutual dislike and criticism, particularly over Tsunoda's social media, but evolves into reluctant cooperation by Season 4 as they support Haida and Retsuko's relationship, even socializing occasionally.

A notable behavior is Fenneko's tendency to harshly criticize activities like group dating or virtual reality before trying them, only to become intensely absorbed afterward. She possesses a distinctive monotonic, robotic laugh described as a series of "HA" sounds, contrasting with her normal laughter when intoxicated. Her character shows subtle shifts, including increased willingness to collaborate with former rivals like Tsunoda for her friends' benefit and eventual, blunt support of Retsuko's romantic relationship with Haida once mutual feelings surface. Meeting Manumaru at a mixer hints at potential romantic interest, though their relationship status remains unresolved.

Fenneko's background includes becoming friends with Retsuko after starting work together, likely due to adjacent desks, despite sharing few common interests. She met the gamer Shikabane while playing Aggressive Heroes online and later in person. By Season 2's end, she and Kabae bond through shared curiosity about Retsuko's personal life.