Mamoru Chiba, also known as Tuxedo Mask, is a pivotal character in the anime series 'Bishoujo Senshi Sailor Moon'. He is the reincarnation of Prince Endymion from the Moon Kingdom and the romantic interest of Usagi Tsukino, also known as Sailor Moon. Mamoru often appears in a tuxedo and mask to aid the Sailor Guardians in their battles against evil forces. As the series progresses, he discovers his own powers and heritage, playing a crucial role in the battle against the Dark Kingdom and other adversaries. His character embodies the themes of love, loyalty, and courage.