Conner is a cat boy with white fur who thinks he can handle BF, so show him who is the true protagonist of FNF and defeat him in a rhythm battle on the following songs:
Can you and BF team up to defeat Conner from FNF?
If so, choose to do it in either the story mode or free play mode, but with both cases, you will have to do the same to win, which is reaching the end of the songs by playing all their notes according to the charts.
This means that you watch when arrow symbols match above BF’s head and press the identical arrow keys at the same time, but be careful not to miss doing it many times in a row, or you lose and have to start again. Good luck!