#bbu theory

[not-the-axolotl]

Been thinking about the theory that Arthur created Billie using the blue gem, and it has some interesting implications that I haven't seen anyone talk about before. Mainly, what that would imply about Billie's genetic situation, as going from XY to XX is quite a jump even when taking the whole magic gem thing in mind. (Where did the second X chromosome come from? What happened to the Y?)

Now one could argue that this wouldn't matter as Billie would just be ✨️magic✨️, but we know Billie can bleed, therefore they must have tissues, cells, and ultimately, DNA.

While its very much possible that Arthur is transmasc and we just don't know yet, I think a (imho) more interesting possibility is that one/both of them is/are intersex. After all, its clear that Billie isn’t a carbon copy of Arthur, as per the differences in coloration and fur paterns and the fact that Billie doesn’t wear glasses even as an adult. Also the ears. (Please keep in mind that from here on out im talking about sex, not gender)

My personal headcannon/theory is that Arthur has klinefelter's (XXY), and that the Y chromosome just got lost in translation at some point in Billie being created. Another possibility is that Billie might have either Turner's(X0) or CAIS (complete androgen insensivity syndrome). There's a bunch of other variations i could list for either of them but I don't want to make this post too long lol. My point is that there's a bunch of ways that either Billie, Arthur, or both of them could be intersex with them being CTF (close to female) and/or CTM(close to male) respectively. And I think that's realy cool :3

( @bbu-fan-blog )

(Anyone being weird about intersexuality will be blocked)

[not-the-axolotl]

Is my theory document done? Nope! Do i keep forgetting about it? Yep! So im sharing it anyway lol. Major spoiler warning tho.

Hyperanalisys go brrr

Introduction The document was originally just going to cover all the evidence that supports the theory that Arthur created Fantoccio, but I

To be real im not nearly as obsessed with billie bust up anymore as i was when i initially starting working on this document, so i haven't realy had much motivation lately. Thats not to say i wont keep adding to this, just that i don't see the point of keeping it to myself anymore.

@bbu-fan-blog

[not-the-axolotl]

I know i mentioned Belle and Arthur possibly being siblings, but it'd be funny if it were the other way around. Like imagine if Aristotle waa adopted and they and Belle are siblings, or if Belle was adopted by Aristotle's family. Just thought that'd be silly

[not-the-axolotl]

Im starting to release that ive bitten off far more than i can chew with this document, so: i want to make this a colaborative project. (Pardon my spelling)

If anyone is interested in joining please let me know!

I do want to limit this to a smaller team (5-10 people at most), and will make a private discord server for this, so please keep that in mind.

@bbu-fan-blog @eeveestarstudios-blog

[not-the-axolotl]

HOLY FUCK THIS CHANGES EVERYTHING

[not-the-axolotl]

Im currently debating making two versions of the document, with one of them excluding the more spoilery content. If I do this it might take me just a little longer to complete the documents, but im sure that a bunch of people would like to see the theories without having stuff spoiled for them.

two versions?

yes

no

see results

Voting ended onSep 3, 2025

@bbu-fan-blog

[not-the-axolotl]

I think now is a good time to mention that a lot of the content featured in the document is, while publicly available, still quite spoilery in nature. (This being, for example, scripts that were shared by the devs in the discord.)

Take care. You have been warned :)

(And to clarify, this doesn’t mean the document is close to being finished, i just wanted to give a heads up)

[not-the-axolotl]

Lil update on the axolotl doc. Only full theory ill be posting untill the document is finished.