Here's a random head cannon I have.
Since Riggy's world is like a paper craft, I like to imagine that portals to Danno's world can appear from any piece of paper.
Riggy often uses this power to scare Danno. He could appear out of anything made of paper, but he almost always chooses to use whatever paper object Danno is using to jump scare him (as seen in the picture below.)
I'm so unreasonably proud of this drawing I made.
Wish I could do that






