I've been thinking about the white deity as well. It seems to be very powerful as it commanded the purple one to stop choking the MC. Also, we don't exactly know what it's meant to represent. We've got all these distinct personality traits linked to the different colours because of the brief dialogue of both the deities and the colour change in the MC. However, the white deity doesn't speak to him but helps him (rebuilding his body after the crash, saving him from the purple one) so perhaps it's not even meant to represent any form of personality. So who is the white deity ? Given how Nova has white hair and pupils, and the white deity has white text, I've thought that there is a chance that they could be one and the same, since the white deity never manifests in the MC but helps him through its own influence, much like Nova helps the MC by giving him advice and comforting him. However, Nova had no power against the realm with the boat and its dreadful inhabitant whilst the white deity's words were enough to drive off the purple deity. So perhaps they could be the same character, related somehow or entirely different.
Also, thank you for your kind words and rejecting the pretentious courtesy with the "you're not alone" stuff. Honestly by that alone you are showing you know your stuff. Plus thanks for discussing this with me even though it took me a while to respond.
All good! I enjoy chatting about the theories and possibilities yet to come in the story! And don't worry about taking a while to respond, everybody has things to do, so it's natural that responses takes time to receive!
Also, no need to thank me, I just like to make people feel better in any way I can, that being said, I wish you the best of luck with any problems you have!