Ulala is the main protagonist of Sega's Space Channel 5 series, and of its several spin-offs. Her character was created by Takashi Yuda in the late 1990s and debuted in December 1999 with the release of Space Channel 5. Ulala's reception remains generally positive among video game journalists and critics. Due to her popularity during the 2000s, Ulala was featured in several other Sega-published video games, as well as promotional material in other media, which included television appearances, several lines of collectible merchandise of the character, and video game cameos.