Friday Night Funkin is a love letter to rhythm games, flash games and the Newgrounds community, filled with all sorts of character cameos.
The popularity of Friday Night Funkin has served as a promo for several characters making guest appearances in it.
The first guest appearances to be seen in Friday Night Funkin beats are the two opponents from the second week of the game.
In the third week of Friday night Funkin players have to face a character that is strongly associated with the Newgrounds story.
This is due to the fact that most of the songs take place in a crowded mall during the Christmas season, with every visible background character being a reference to something.