Now, I don't know much about this "Rebirth Theory" everyone is throwing ideas around. However, unless I missed it, I haven't seen one concerning the names.
We all know that Kingdom Hearts symbolism lies within a lot of the names- especially with main characters
Sora- Sky
However the Kanji for Sora (or in Chinese is Kong) 空 has many meanings such as sky, air, void/empty.
The last two translates into Latin as Ventus and Vanitas
Riku- Land
Kairi- Sea
Kairiku- Land + Sea
Aqua- Water
Terra- Earth, land
But the fortellers names are
Invi- Possibly means to help or assist; is it a variation of envy?
(Latin) Gula- Throat
(Latin) Ira - Anger
Aced- Skilled or expert
(Latin) Ava- Grandmother.
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Ephemera means short lived, brief
- Also the scientific name for the mayfly which lives an extremely short amount of time
(latin) Vulpeus- fox
I'm behind on this Unchained Chi stuff because of school but yeah... Y'all can continue with the theories. I will lurk.