Fun Girl

'The Fun Girl is a mysterious character in Yandere Simulator''. Currently she can only be found by changing the code's Fun Value in the February 8th, 2016 Build or trying to add Osana via the JSON file as of the January 3rd, 2017 Build.'''

Appearance
On the Yandere Simulator website and the January 3rd, 2017 Build, she has pale white skin with black veins coursing through. She has white hair in pigtails with two long, thick strands of hair hanging down. She has black eyes and black mucus dripping out of her eyes and mouth, and she wears the default school uniform but colored black with a white neck tie, along with black stockings and shoes.

In the February 8th, 2016 Build, the Fun Girl is shown as a pale, deathly white girl in front of a black background. She has long, white, messy pigtails. She does not move, and wears a grin. Black mucus comes out of her mouth and eye sockets, pouring down. When the fun value is set to 666, she appears red rather than white.

February 8th, 2016 Build
The Fun Girl can be found in-game by editing the Fun.txt in the StreamingAssets Folder. Within the text, there is a single zero, which the player can change. If not changed, the game will run as normal. Depending on the number the player types, there will be different responses. Once a number is entered and the game is started up, the menu will not appear, but the black screen with the floating head will. A text that depends on the number entered will appear slowly on the screen. The head will get close for a quick second jump scare before the game crashes. Only numbers 1-10 and 666 will work.

Through the texts, the Fun Girl will explain an experiment gone wrong where she was shattered across time and space where everything was still the same, except for the fact that she never existed.

After the February 15th, 2016 Build, she will not appear anymore. It will still be a black void, but only the text "BUT NOBODY CAME" will appear before the game crashes.

In a file named 'Level13', all of her responses can be seen.

666. YOUR IDEA OF "FUN" SEEMS VERY VERY INTERESTING.
 * 1) SO, YOU LIKE TO HAVE FUN? ME TOO.
 * 2) I HAVE A PLACE IN THIS WORLD. WELL, I WAS SUPPOSED TO.
 * 3) MY UNIVERSE IS IDENTICAL TO THIS ONE...WITH ONE DIFFERENCE.
 * 4) IN THIS UNIVERSE, MY FATHER INVENTED MANY THINGS. IN MY UNIVERSE, MY FATHER HAD JUST ONE MORE INVENTION.
 * 5) HIS MACHINE WAS GOING TO CHANGE EVERYTHING. IT DID. JUST NOT THE WAY HE WANTED.
 * 6) THE INVESTORS WANTED HIM TO PROVE THAT IT WAS SAFE. TO DEMONSTRATE HIS CONFIDENCE, HE PUT HIS OWN DAUGHTER INSIDE.
 * 7) THE MACHINE WAS TESTED ON MANY ANIMALS... BUT IT HAD NEVER BEEN TESTED ON A HUMAN.
 * 8) BEING SHATTERED ACROSS TIME AND SPACE WAS NOT THE WORST PART. THE WORST PART WAS BEING FORGOTTEN.
 * 9) IN THIS UNIVERSE, MY FATHER ONLY HAD ONE DAUGHTER. SHE'LL NEVER KNOW SHE HAD A SISTER.
 * 10) I CAN SEE EVERYTHING. HEAR EVERYTHING. BUT NO ONE WILL EVER KNOW THAT I EXISTED.

Any value after the 2/15/16 Build: BUT NOBODY CAME.

As of the January 3rd, 2017 Build, changing values in the folder won't do anything.

As of the January 4th, 2017 Build, the fun.txt file has been removed from the game files.

January 3rd, 2017 Build
As of the January 3rd, 2017 Build, she can be found in-game by attempting to add Osana Najimi via the JSON file. When the player starts up the game after doing this, Fun Girl will appear and tell the player that they can no longer add Osana. After this, the game will crash. If the player deleted the fun.txt file, or edits the JSON file while the game is running and then restarts the day to apply changes, Yandere-chan will be taken to a version of the game with a low school atmosphere, no students and with Fun Girl chasing her. When Fun Girl catches Yandere-chan, the game will crash.

As of the January 4th, 2017 Build, the fun.txt file has been removed from the game files.

In a file named 'Level14', all of her responses can be seen.

Her dialogue goes as follows:
 * 1) HELLO!
 * 2) SO, WE MEET AGAIN.
 * 3) OR, PERHAPS WE NEVER MET.
 * 4) OR, PERHAPS WE DID MEET, BUT YOUR MEMORY WAS WIPED.
 * 5) OR, PERHAPS WE DID MEET, BUT IT WAS IN ANOTHER TIMELINE.
 * 6) YOU'LL HAVE TO FORGIVE ME. IT'S QUITE DIFFICULT FOR ME TO KEEP TRACK OF THESE THINGS.
 * 7) I'LL CUT TO THE CHASE.
 * 8) YOU'RE HERE BECAUSE YOU CHANGED THE NAME OF STUDENT #33 IN THE JSON FILE!
 * 9) YOU WERE PROBABLY TRYING TO GET OSANA TO SPAWN. I UNDERSTAND; YOU WANT A GLIMPSE OF THINGS TO COME...
 * 10) HOWEVER, I CAN'T LET YOU DO THAT.
 * 11) THAT "YANDEREDEV" GUY ASKED ME IF I'D BE WILLING TO BLOCK PEOPLE FROM SPAWNING OSANA...
 * 12) IT SOUNDED SLIGHTLY LESS BORING THAN DRIFTING AIMLESSLY ACROSS TIME AND SPACE, SO I AGREED.
 * 13) I'M SURE YOU'LL FIND A WAY TO GET PAST ME. AFTER ALL, YOU'RE THE TYPE OF PERSON WHO EDITS GAME FILES.
 * 14) I DON'T CARE IF YOU GET PAST ME. IT'S YANDEREDEV'S PROBLEM, NOT MINE.
 * 15) HOWEVER, YOU SHOULD BE WARNED...
 * 16) THIS SCREEN IS ONLY THE FIRST LINE OF DEFENSE. MORE COUNTERMEASURES AWAIT YOU BEYOND THIS POINT.
 * 17) YOU SHOULD PROBABLY JUST BE A GOOD CHILD AND WAIT UNTIL OSANA IS READY TO BE REVEALED.
 * 18) OKAY, THAT'S ENOUGH TALKING. I'M GOING TO KICK YOU OUT NOW.
 * 19) IF YOU WANT TO PLAY THE GAME, CHANGE STUDENT #33'S NAME TO "RESERVED".
 * 20) BYE BYE!
 * 1) BYE BYE!

Yandere Simulator Website

 * Main article: Easter Eggs

If the Konami code is entered on the Yandere Simulator website's Character page, all profiles and images are replaced with Fun Girl's instead, with all information regarding her in question marks. The page's color scheme will change to red and black, with static in the background. To revert it, the page must be refreshed.

The Japanese text appears as follows:

アラアラ...

あなた誰？

ふふ...

はじめまして.

私たちは一緒に多くの楽しみを持ってしようとしています.

This roughly translates to:

"My, my...

Who are you?

Hehe...

Nice to meet you. We are going to have a lot of fun together."

If the cursor is moved over to the full body image of Fun Girl, the screen will 'switch off' leaving nothing but a black screen on the website.

Yandere Dev's unlisted video
There is a hidden video that can only be accessed after translating the binary found on the update video October Progress Report: Osana Progress, Framerate Improvement, and Pose Mode (Fun Girl can also be seen in this video for a few seconds at the 6:00 minute mark). This binary code translates to the video Fun.mp4. The video plays a full body image of Fun Girl but with frequent distortions and glitches as the video goes on. A backwards message is also heard throughout the video and when backmasked, it plays a voiced version of the Japanese text from Fun girl's Yandere Simulator website information.

Trivia

 * YandereDev claims to not know this Fun Girl, and has made a subtle hint that she is from a game.
 * The Fun Girl was implemented because of the amount of data-miners trying to find secrets within the game's code. YandereDev felt guilty for not having any secrets so he decided to add the Fun Girl into the game. This paragraph was later deleted as to not spoil the surprise.
 * She was implemented in the February 8th, 2016 Build and removed in the February 15th, 2016 Build.
 * She was re-implemented in the January 3rd, 2017 Build.