Nico Nico Nii is the signature catchphrase of Nico Yazawa, a character in Love Live! School Idol Project, the anime series that began in 2013 about a group of school idols. Nico performs the phrase with a distinctive heart-shaped hand pose, turning it into her trademark greeting and a running joke among fans. Clips of the moment circulated widely in anime communities, then spread to TikTok, YouTube edits and soundboards as a shorthand for playful confidence. It remains popular because it is instantly recognisable, short and easy to drop into almost any cute or triumphant moment.