In this model, all three webcomics are really part of a single continuity where there is No Fourth Wall or at least a very, very weak one (hence why characters so frequently get killed only to return from the dead in all three). This is, in fact, an acknowledged fact within the PVP webcomic. Additionally, each of the creators (Sufficiently Advanced Authors of course) has the capacity to enter into the universe physically (as in Jerry/Tycho, Mike/Gabe, Fred/Piro, Rodney/Largo, etc.). Some of the characters are aware that they are in a comic strip, such as the characters of PVP and possibly Gabe and Tycho) while others are completely unaware, such as (most of?) the characters of MegaTokyo.
Also, for some reason, only Gabe and Tycho are actually aware that they are Sufficiently Advanced Authors, whereas both Largo and Piro are completely unaware of this fact, perhaps due to the fact that Fred Gallagher appears to have another avatar running about in the universe (mentioned in a Penny Arcade strip located at Sakura Con). Other characters are aware of this as well since although Scott Kurtz does not appear in-universe in PVP, Gabe and Tycho and the staff of Penny Arcade do.
Yeah, that's confusing. But what good Epileptic Tree isn't?
- Additionally, because Gabe and Tycho are the only authors that both are aware of their nature and are known to be creators by the world at large, this may explain why Gabe's birthday is an international holiday that puts Christmas to shame.
- By extension, other web comics that might be a part of the shared continuity are The Whiteboard (whose characters cameo in PVP) and Applegeeks, which has a long-running crossover with MegaTokyo.