Epep-kun is a young caucasian but tanned androgynous child, commonly considered a boy but suggested early on to be a reverse trap. He has halflong blond hair that falls down in straight front bangs obscuring his eyes, and a mouth full of sharp teeth. He wears a hoodie with a pale yellow front and a black back, coming together on the sides and sleeves in a curtain wall pattern. On the sides of the actual hood two yellow rings are emblazoned, which give the impression of eyes when Epep-kun wears it over his head. In that situation his hair also looks like sharp teeth, which makes the entire hood look like a gaping maw ready to strike at the viewer. Aside from the hood Epep-kun also wears gray shorts, and sky blue flip-flops with white socks.
Epep-kun is levelheaded, easygoing and cheerful. He seems to mind when people consider him a reverse trap (not to the point where it makes him take steps to appear more masculine though), but mostly he prefers to avoid and diffuse conflict rather than engage it. That said, he's not afraid to bluntly state his thoughts, something he may have picked up from his mother, Kun-ojii-san.
Like the other prospective 8kun mascots, Epep-kun was created around the middle of October 2019. His name is both a reference to Pepe the frog, who enjoyed a fair amount of popularity on 8chan during the days of meme magic hype (Pepe was considered an avatar for the ancient Egyptian chaos god of darkness, Kek), as well as Apep, also known as Apophis (another ancient Egyptian god of chaos, but a snake). This link also ties into the Ogdoad, a group of 8 primordial Egyptian chaos deities which consisted of 4 male frog gods (including Kek) and 4 female snake goddesses, and the transition of 8*chan* (-chan being a suffix commonly used to address girls affectionately) to 8*kun* (-kun being -chan's equivalent for boys). However, the analogy isn't perfect since the sexes got swapped, which may be why Epep-kun is intentionally designed androgynous. Or it can all be a huge coincidence since Epep-kun was apparently named independently from his design process (though this only works in the meme magic theorist's favor).
Epep-kun did not win the mascot poll, but was popular enough that he got reworked into serving as expanded cast for Kun-ojii-san, as her son.