Ah! The arm! Originally attached to a otherworldly being that was severed when Crange's brain stopped the portal that one time. Then after that the Arm took over a bird (??) and attacked Crange again. And of course the Arm had a hand in the Ants arc.
As I continued to write new stuff and consolidate ideas as the comic comes to its end, I definitely didn't want to forget to give this big guy some closure. I will always remember writing Anime Club those years ago, introduce Daniel as one of several shitty but important enough antagonists to the boys, then completely forget to use him in the final chapter, save for the explanation/apology comic I did for fun (it's in the book!).
In the soundtrack of He is a Good Boy i use to get myself in the right headspace for writing the comic, "The Arm" by Islands was definitely a big inspiration for all this.