[[WMG: Finney wants to use the scroll to rewrite history so that Billy Bat will become completely fictional.]]
Finney says that whoever has the scroll can control the bat. What if gaining control of the bat means that the bat will become a fictional character? If the bat is not real, then it cannot influence human events. Furthermore, fiction carries ideas and influences history. If one makes the bat a fictional character and indues it with certain ideas, it could be used for brainwashing. In this way, the U.S. elite can control the world. And what version of Billy Bat will be used to do this? Chuck Culkin's. Going with the above theory, however, doing this will endanger the world due to AuthorExistenceFailure.

[[WMG: The bats are manipulating history...]]
...For the sake of writing Urasawa's manga. [[BreakingtheFourthWall Ultimate 4th wall breaking ahoy]].

[[WMG: When the last time history is reset, there will be only Mickey Mouse and our world]]
Combining the two above: No matter who changes it, it would be reverting everything to a world without Billy. The last few pages of the series would be Urasawa himself drawing the first page, very possibly in photograph instead of ink.
* Jossed, there's no more alternate earths/dimensions/timelines/etc. If they can't save their "current" world they're screwed.

[[WMG:The Bat is [[CthulhuMythos Nyarlathotep]]]]
A supernatural entity who takes enjoyment in actively manipulating and messing with humanity? Seems up Nyarly's alley.
* Canonically, one of Nyarlathotep's masks is a colossal god-bat...
* Honestly, the best argument that can be against this theory is that it would make ''too much'' sense.

[[WMG: Even when the series is completed, none of it will make any sense.]]
Ever read Manga/TwentiethCenturyBoys? I ''still'' have no idea what was going on there, even after reading it and the second series.
* I'll try, it's been a while:[[spoiler: A group of children play superheroes. An outcast wants to join them but can't/doesn't. In the future (uh, present) where they're all losers the outcast has spent his life devoted to a plan that will "save the world" that he stole from eavesdropping on the kids all those years ago and frame them as terrorists in the process. The group are now rebels (and no longer losers thanks to the fight for their lives) and they and their allies devise various plots to depose of the outcast-turned leader but then ''another'' outcast who also ran afoul of the same group of children takes the leader's place and years later turns Japan into North Korea because he's not as far-sighted as the original. It's up to the group to reunite and stop the madness once and for all before the (second) leader does it first.]]

[[WMG: Kevin Goodman is Billy Bat's version of UsefulNotes/BarackObama]]
Kevin Goodman is of mixed raced and was born in 1960 (or possibly early 1961) and the bat declares him a savior. Randy Momochi, the taxi driver, already mentioned that there's gonna be a black president in the white house to his mom, Diane.
** Josed. But he does become the heir president of Golden Cola AND president of Billy Bat Land.

[[WMG: [[spoiler: Alternate universes still exist]].]]
[[spoiler: Their just hiding. Either that or they'll be able to return.]]

[[WMG: ''Billy Bat'' is a sequel to ''Manga/{{Bokurano}}''.]]
The game has finally weeded out all the other universes and Billy's personality seems pretty close to Dung Beetle's.

[[WMG: The bats are 4th dimensional beings [[AFormYouAreComfortableWith who simply take the form of bats]]. Humans are a CosmicPlaything for the black bat.]]
It’s heavily implied that the bats are beings on a higher plane. More specifically, they are 4th dimensional beings. They exist outside time, and thus they can manipulate it.

Here’s the kicker though: Remember when [[spoiler: the real Chuck Culkin]] compared changing the past being like a cartoonist using an eraser and how two dimensional soldiers couldn’t harm real people? This leads to the idea that the human world is actually entertainment for the bats…or specifically maybe just the black bat. The white bat wants to give humanity some control back through the use of chosen manga-ka, such as Zofuu and Kevin. Yet the manga-ka doesn’t have absolute power. Typically, they can only foresee what will happen within their lifetime and draw manga based on that. It is also exceedingly difficult to avoid drawing out the visions as they appear. Furthermore, any changes the manga-ka tries to make may be difficult to implement, just as it was with Kevin and [[spoiler: the JFK assassination]]. Yet there is an image of what appears to be [[spoiler: a time machine]] in the scroll…so perhaps that can unlock the manga-ka’s full power. Or something.

The black bat wants horrible events to occur, however…seemingly to save the universe. And there is a twisted logic here…because if humanity finally gets a happy ending, with no more struggles…the story will end, along with the world. The black bat deliberately creates conflict just to keep the world in existence. It views this as favorable to both humans and itself, as humanity will continue to survive indefinitely in exchange for the black bat being able to mess with everyone. Of course, all stories have to end eventually. (In fact [[spoiler: the black bat told Oswald that if Kevin dies in 1963, humanity would die out “ahead of schedule.”]]) The black bat will probably just continue to mess with humans until tragedy is unavoidable or it gets bored.

[[WMG: Billy Bat is related with Franchise/{{Batman}}, not WesternAnimation/MickeyMouse.]] Really. In ComicBook/FinalCrisis, Batman is blasted by ComicBook/{{Darkseid}} and sent in the prehistory. He meets with Anthro. He organizes everything to defeat Darkseid in the future (his present). The "Bat" goes through centuries, millennia and influences people, history, legends, philosophy, civilities. Cavemen see the sign of the Bat in the caves and so the people after them. See ComicBook/TheReturnOfBruceWayne, panel 3-027. However, since Batman does not exist as real character in the manga, we have some possibilities.

1) History was modified. Superheroes were erased from the history - but super-villains, too! So one of the two bats is related with Batman and the other - perhaps - with Darkseid, explaining the duality.

2) Batman's job through aeons influenced other universes and is sprouting through the {{Metaverse}}.

3) Billy Bat is the fusion of this influence with Mickey's analogue job in the Disneyverse because of EpicMickey (but there exists also Italian stories with time alterations: for instance [[https://coa.inducks.org/story.php?c=I+TL+2918-2P&redirected=1 "Topolino e la marea dei secoli"]]).