First, the NeN:
It will be a mixture of mutant genes and magic, and cannot be stopped or neutralized by the means that stop these two sources.
Anyone will be able to have it if it is a chimera, or if a chimera awakens that person, humans cannot awaken other humans or anything like that, I created this power to be of the race
And they can be seen
The Tang: I actually put a lot that I don't know if it will be used, like romance or harem, they may be used,I put a lot into attracting a good audience, which I already have now. If you want, leave it in the comments.
The future:I won't deny it, I had everything planned so far in the story, the future is a bit hazy, so I'm accepting tips, suggestions and ideas, thank you.