Board Thread:Theories Discussion/@comment-13376834-20130430230244/@comment-6192846-20150910173607

23.122.217.39 wrote: However, the Rin character is clearly a researcher of biological creation or at least someone engaged in tampering with it, whereas Levia is a researcher of souls.

Levia is a researcher of minds or the psychological/emotional core of people to be exact. That and souls are different terms in mothy's vocabulary; the extent of their interconnected relationship is another story.

23.122.217.39 wrote:

They don't even look alike. Which you can say is the result of mothy's original design for the character being a placeholder, but then if you can say that you can also say the Vocaloid choice is a placeholder too.

There have been several characters with varying (often inconsistent) designs before finally getting nailed down in a light novel or story. That doesn't affect the Vocaloid represented, so I'm not sure they're as correlatable as you're presenting them to be.

23.122.217.39 wrote: Furthermore, Levia did not reincarnate as Elluka, she unknowingly possessed her body and had her memories suppressed.

Outright incorrect. Levia and Behemo reincarnated in Elluka Chirclatia's body. It is because of this reincarnation that two rules concerning it activated: (1) only one consciousness (mind) may manifest within a single body, and (2) the reincarnated souls' memories must be sealed. This is why the unique entity of Elluka Clockworker came to be.

Sligneris wrote: I never considered Rin in Laboratory of the Full Moon to be the scientist herself, surprisingly. Personally, I think a lot of its lyrics point to Levia. As pointed out, there really isn't anything other than the Vocaloid tying the two together. If the Rin character is Levia, we're going to need a lot more supporting it imo.

Back to the Irina theory: Which Rin would Irina possess to use for these experiments? Why choose her over someone else? Ultimately, Irina being the Rin in FML also means she (or the medium) have to tie back to Wordplay/Clockwork Lullaby, going by FML's PV.