Undertaker Phantomhive is a mysterious and eccentric character in the anime and manga series Kuroshitsuji (Black Butler). Though he initially appears as a quirky funeral director with a penchant for dark humor, he is later revealed to have deep ties to the Phantomhive family and the supernatural underworld. Known for his long silver hair, haunting grin, and cryptic personality, Undertaker often assists Ciel Phantomhive and Sebastian Michaelis, playing a significant role in uncovering dark secrets throughout the series.