In chapter 2, we have werewires
In chapter 3, we have Ramb who is referenced as the “third secret boss” in the Spamton sweepstakes with lambs and sheep. He is gone when we do the Sword route, implying that FRIEND isn’t done with him.
In chapter 4, Jackenstein says he’s supposed to be at the festival.

Ramb is coming back in chapter 5. As Dracula!