I hate to bring back the dead, but regarding fiction rules once again....
It is within fandom rules to add new aspects of the sessions system, as long as they don't contradict anything within the comic, right? And adding a new species isn't going too far, is it?
I was just thinking about the universes as organisms, and how they seem to breed in an asexual manner, when it hit me that there are probably 'strains' of universes, much like there are strains of bacteria. I mean, the Trolls, Humans, and Cherubs are all rather alike, from a certain perspective- they have similar concepts of gender, romance, interaction, and have anatomy that is pretty similar, or at least appears similar. I mean, their societies are hardly identical (and we don't even know the Cherub society), but Alternia, Beforus, and Earth are rather close to one another in many ways. So what if the cause of this is that the new universes and new species are always mostly similar with their progenitors?
And, if so, what if the multiverse system has way of promoting diversity and change, a sort of 'universe breeding system' that introduces ideas and species across sessions, in order to get them intermingling across strains and producing new, unique results?
Assuming I can add mechanics and species without crossing any lines, I was thinking of a sort of cross-pollinator species, with a unique session meant only to continue its existence (and not produce new universes). The species, kept alive but occasionally forced to renew itself to prevent stagnation, would be designed around reliance on the technology for random pollination. The species, like the multiverse, would need to draw upon these sessions for genetic variation (being a sort of hive-mindish, organic-tech civ), and, whenever they took these variations, would send similar copies into thousands of random spawning universes.
Of course, the purpose of this will be for more than simply slopping my personal ideas onto Hussie's sanctified masterpiece, but will have a bearing on the plot, and a significant one. However, that said, I understand that major universe changes are often branded heresy among fandoms, and it would not surprise me to hear that this is improper for a fanfic. But is it?