Kakashi Hatake in One Punch Man Explained

Let's cut straight to the chase: Is Kakashi Hatake a character in One Punch Man? The simple, definitive answer is no. While the thought of Konoha's Copy Ninja facing off against Saitama, Genos, or the myriad of heroes and monsters from the One Punch Man universe is undoubtedly a thrilling fan-fiction scenario, Kakashi Hatake is an iconic and beloved character who exists exclusively within Masashi Kishimoto's acclaimed Naruto series. There's no crossover episode, secret cameo, or hidden lore linking these two distinct anime worlds....