You may have come across a viral meme video where an annoying little girl keeps repeating the words "nico nico ni." You probably wondered what the hell that is?
It isn't random baby talk. The line belongs to Yazawa Nico from Love Live! School Idol Project — and Japanese already had a smile sitting inside her name long before the remixes started looping that pose.
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What is Nico Nico Nii?
The phrase "Nico Nico Nii" is the catchphrase of Yazawa Nico [矢澤 にこ] in Love Live! School Idol Project. In Japanese it is written にっこにっこにー, and you'll see it romanized as Nico Nico Nii, Nico Nico Ni, or Niko Niko Nii. After the anime aired, the line started showing up on 4chan, Reddit, and other boards popular in Japan and among otaku in the West.
The character Nico Yazawa has an aggressive personality and is quite self-confident. Sometimes she needs to switch on a brighter, more moe personality to act like an idol, so she throws out "Nico Nico Nii" to play cute.

The phrase first appeared in the fifth episode of Love Live!, where Nico tries to demonstrate her impression of an idol to the rest of the cast. The scene stuck because of her expression, the form, and that forced-cute energy. It wasn't just the line that went viral: the hand sign, the little heart, and the whole pose are part of the joke.
How Nico Nico Nii went viral
After that first appearance, the term took over websites in thousands of gifs, videos, and fanarts. Super Junior's Kim Heechul, a well-known Love Live fan, has done the line and the pose on Korean TV. Remixes and MAD edits kept looping the audio for years — one of the old YouTube mixes even disappeared when the uploader deleted the account.
Some fans started calling Nico "Satan," not because the words are occult, but because the character is loud, pushy, and hard to ignore. That joke only generated more memes, gifs, and fanarts.
What is the meaning of Nico Nico Nii?
Some people imagine this phrase has absolutely no meaning. The character's name is Nico, which already explains why she uses it. In Japanese, though, there is also the expression niko niko [にこにこ], the onomatopoeia for smiling, so she is basically saying that you are smiling in your heart.

The stretched "nii" at the end can look like the particle ni [に], depending on how you slice the sentence, or she might just be doing what other anime characters do when they invent an ending such as "nyan" to sound cuter. It isn't a grammar puzzle. It's rhythm.
To better understand the expression, look at the entire line Nico Yazawa delivers:
Anata no Heart ni Nico Nico-nii
- You are smiling in your heart.
- Anata - あなた - You
- Heart - Heart
- Niko Niko - Smile
Egao todokeru Yazawa Nico Nico
- And I will put a smile in your heart!
- Todokeru - 届ける - deliver, send
- Yazawa - She referred to herself in the third person.
- Egao - 笑顔 - Smile
Nico-nii te oboeteru Love Nico nii
- Remember Nico! Nico loves you!
- Oboeteru - 覚えてる - Remember, do not forget;
There is a video site similar to YouTube called Nico Nico Douga. That name sits on the same smile onomatopoeia, which is one reason Nico's line felt familiar the moment it left the classroom.
The smile her father left her
In Nico's School Idol Diary chapter, the jingle is older than the school-idol group. Her parents named her Nico hoping she would always have a smile on her face. Her dad would sing "nico nico nii" whenever he said her name, and again when he took family photos. After he was no longer around, she kept throwing that same smile at her younger siblings — and later at a stage.
The Name Nico Yazawa
Some people write Nico Yazawa, and that official romanization is not wrong. Japanese doesn't use a standalone letter "C" the way English does, so the given name is niko [にこ] in the native script. The first name is written in hiragana, so it has no deep kanji meaning; it probably refers to the onomatopoeia for smile. If you want the wider logic of how given names get chosen, there is a separate guide to Japanese names.
In the Japanese language, the surname or family name is written first. Yazawa [矢澤] is written with [矢], which literally means arrow or dart — fans like to read that as a shot aimed at the audience. The official given name stays にこ.
Nico Yazawa is 1.54 meters tall, blood type A, her measurements are B74-W57-H79, and she was born on July 22; in the anime, she is 17 years old. She is voiced by Tokui Sora. Offstage she is also the one looking after Cocoro, Cocoa, and Cotaro, which is why that forced smile has a job to do at home, not only in front of a crowd.
The Legendary Nico Nico Knee
The fighter Marcellus Black, known as Otaku on Twitter, shouts the line and makes the gestures of Nico Nico Knee to finish off his opponents. A 2016 ring clip of the move spread the same way the anime scene did: once, then everywhere. Years later the joke even turned up as a crowd sign in WWE 2K22 that just reads "NICO NICO KNEE!!!"
Did you have any idea about the meaning of nico nico ni? Now when someone yells it at you, you know it isn't just noise. It's a smile with a pose attached — and, if you're unlucky in a wrestling ring, a knee.
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