Watching Mogtalk's episode with Anonymoose and Ethys Asher, I noted the bit when Ethys speculated that maybe Mini-filia was a resident of the First who was a priestess of a Light cult or something, and she willingly gave up her body for Minfilia of the Source to possess while on the First.
And I was thinking that the Japanese name for Mini-filia's role, the "Oracle of Light", was "光の巫女", ie "
Miko of Light". And one of the roles of the miko in traditional Shinto is to be a vessel to be possessed by a given kami (voluntarily, or at least as part of their duties).
The more I think about it, the more plausible it sounds. The translation to "Oracle" might also be a reference to the Western traditions of such, who reportedly also go into god-induced trances to give prophecies.