Talk about hypocrisy.
He is the product of human thought and potential, but because this same human potential displeases him when it goes against his desire, he feels nothing for those that he thinks lesser but "nurtures" those that he sees potential within... but it is clear that this "nurture" isn't because betterment.
I do feel bad for the Kami, I think their presence makes the world a little richer, but if the long way solution is literally between letting them die and depriving an entire species of their potential and free will, well... sad as it is, let them pass away.
What the chances are that the sennin is Ozuno of the future, or at least a possible future, somehow... I hope not, it seems like such a low-hanging fruit twist, it takes away from the expanse and diversity of the story.
Let him be someone else, not like there couldn't be multiple men that have fallen in love with Koto-sama... she is beautiful.
The fantasy and sci-fi aesthetics are so well blended.
Sarara has spunk.
WAIT, this means that Oni are just humans who lost their Mantra. By giving in to hunger and not thinking about what or who they eat, they become mindless beasts. The Mantra they hold is either lost, or repurposed to eating, which is what gives them their strength.
This is just Digital Devil Saga with extra steps!
There is a thread of truth in what you said, can't quite word it the right way, but I wouldn't say they "lost" their mantra.
Trying to word it... if the horns are a "punishment" because of their debasing themselves, and letting go of their Higher Thought, but I don't think their mantra is completely lost.
I mean... there is Zen and an entire village of Oni that are all very civilized and clearly do their best to not fall back into savagery.