Fenneko (フェネ子) is an office worker and a supporting character in the Netflix Original series Aggretsuko.
Fenneko is Retsuko's closest co-worker and is a renowned social media stalker.
Fenneko's appearance is based on a Fennec Fox. She has light fawn fur across her entire body except for a dark fawn tri-point stripe down her forehead. Like Retsuko, Fenneko wears a navy blue vest and skirt, white dress shirt, and black shoes at work. Outside of work, Fenneko wears a baby blue turtleneck sweater, gray skirt, black tights, and brown boots.
Fenneko is quiet, perceptive, and can easily figure out what her co-workers are thinking just by watching their mannerisms. Fenneko thinks it's hilarious when Retsuko puts herself in embarrassing situations at work and is rightfully angered by how the higher-ups treat Retsuko. Fenneko is a self-proclaimed pro social media stalker, and while she is always right, Fenneko gets extremely upset if she thinks that she might be wrong in her observations. She is very opinionated and isn't afraid to voice those opinions, like when she told Haida in We Wish You A Metal Christmas that he should just give up on Retsuko since she already rejected once.
Retsuko and Fenneko became friends some time after they both started working for the same trading firm. They don't seem to have a lot of similar interests or hang out often, but likely became close because they sit next to each other in the office. They do go out for drinks and dinner occasionally, and Fenneko accompanied Retsuko to a mixer that Tsunoda invited them to.
Haida and Fenneko are drinking buddies, and until Episode 10, Fenneko was the only one who knew of Haida's secret crush on Retsuko. Fenneko would try to keep guys away from Retsuko in order to give Haida more time to work up the courage of asking her out. But after Retsuko rejected Haida, she no longer saw reason to help out and even told Haida he should just give up on Retsuko.