Nightmare Boyfriend (Nightmare BF) from the game "Friday Night Funkin'" (FNF) manifests as a sinister, dark iteration of the standard Boyfriend. He is predominantly black, sporting glowing blue eyes and a frightening, twisted smile. His appearance is accentuated by horns, and his hair is a disheveled, chaotic tangle. The outline of his body has a bluish hue that glows slightly, and he aims to corrupt Cuphead and Sans. However, they are undeterred and unafraid to challenge BF in a rap battle, featuring the track: Good Time. They are determined to outplay BF at his own game, just as he previously triumphed over both dangerous and ordinary foes with the strength of music before his corruption. We extend our best wishes (and hope) to Cuphead and Sans in their quest to save BF and restore him to his former self.