Mr. Filler appears

As Mimoko and Hagemi prepared to head out, they suddenly found their path blocked by a mustachioed man in a mask, suit, and top hat.

"Behold! It is I, Mr. Filler! I've come to take you to the magical realm of filler!"

Mimoko and Hagemi prepared to warp away anyway.

"I have kidnapped... Yuusuke!" Mr. Filler cried as he pulled out a tablet containing an AI generated image of Yuusuke bound and gagged.

"Wow, didn't know you turned his hands into fleshy spoons with fingers. Bye," Hagemi snarled as she and Mimoko warped away.

"No! I can't let the story progress. The author... The author was feeling too tired! And there's no backlog!" Ah, but what can I do... I'll hog the screen!"

"Security, we have a homeless guy thinking he's on a TV show or something," Pnina snarled.

Mr. Filler was vacated from the premises momentarily.

...

Mr. Filler gazed out the window. "The plot... The plot is progressing... But there is no content, there is nothing new from the author... Kisha... I must seek Kisha."

Shattering the window with a kick, Mr. Filler leapt out and flew threw the air on his outstretched cape. He flew some distance until arriving at a building. Entering, he found Kisha on set before a live studio audience.

"Who are you!?" Kisha cried as Mr. Filler ran onto the stage.

"I'm Mr. Filler, and I'm stopping the plot! Now Kisha, begin talking about side characters, one a day, starting tomorrow."

"What!? Ugh, someone advance the story!"