The main reason I’ve discounted the theory that Noelle is turning into an Endbringer is that Tattletale’s power said Leviathan was never human. But it just occurred to me that the same Interlude showed us that Tattletale is basically super-Sherlock, and we’ve seen several times that her power can be wrong once in a while if it’s basing things on insufficient information.
On another hand, if Leviathan was human at some point, what would the narrative point in a mostly trustworthy source saying he wasn’t be? Was something planned to rely on Tattletale believing the Endbringers were never human? I suppose if Noelle were to be turning into an Endbringer, inaccurate beliefs about Leviathan may cause her to not be able to figure that out, but that still feels like a stretch as far as justifying such a misdirection for the audience goes.
A third option is that Leviathan was never human, but the other Endbringers were. That would imply that Leviathan was the source of their power somehow. I’m not sure I like this hypothesis.
Also, another point against this theory is Noelle’s increasing hunger. That seems to clash with the existing Endbringers appearing not to need substinance, though it might be a result of an incomplete transformation.
So yeah, currently there are more things pointing away from Noelle transforming into an Endbringer than towards it, but it’s something that’s worth keeping in mind nonetheless.
She’s definitely turning into something, and she probably ain’t gonna stay contained indefinitely.
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