Tuturuu is the trademark greeting of Mayuri Shiina, a central character in Steins;Gate, the science-fiction series first released as a visual novel in 2009 and adapted into anime in 2011. She uses the invented word as a cheerful hello, and fans quickly adopted it as shorthand for her gentle, optimistic personality. Shared through anime clips, soundboards, reaction videos, and short-form edits, the phrase spread far beyond the show itself. It remains popular because it is instantly recognisable, easy to imitate, and carries a warm, nostalgic feeling for longtime viewers.