The Confidence Stamp, the Variable Claim
The line is fixed. The claim is whatever you want it to be.
One variable: the confidence trend works because the stamp is fixed - "Everyone knows me, I'm Bulin 47" - and only the claim under it changes. The stamp carries the energy, the claim carries the joke. "I'm the one who brings snacks" lands the same as "I'm the one who is late but on purpose", because the stamp is doing the confidence.
Why it reads as a meme: the gap between the grand line and the tiny claim is the whole joke. A stadium-level declaration of a very small fact. The bigger the stamp, the smaller the claim should be, and the gap is the punchline.
How the game locks it: you type the claim, the page stamps it under the line, and the confidence dial stretches the gap - dial it low and the stamp is understated, dial it up and it is pure brat. The claim is the variable; the page is the stamp.