- This means they could be susceptible to other Gensokyo entities, such as fairies or humans, who are not youkai.
Of course; fairies, humans, gods. Which Byakuren says youkai may as well be, but I'll need to figure that more pending suggestions.
- This depends on how you define invisibility in your bigfic. I am no expert on fiction, so you have to do the research.
Noted. Time to put my degree to actual use then.
- As far as I know, there is no defending to be done in Gensokyo. Usually, a higher power would send off their hypercompetent incident resolver to do the work for them.
Except in LoLK they kinda busy on the Moon, and I don't think most warbots play with spell cards. And the Lunarians wouldn't send things that Yukari could gap away. What was she doing then? Something else up for creative interpretation, and work on my part. But I'm always open to suggestions.
- Everyone's idea of Gensokyo is different[.]
Oh yes. I go more for character development and worldbuilding, with a modernist and practical focus. In contrast to the more common jokes and shipping, and what I can politely refer to as not letting common sense get in the way of taking it easy. : p
- I hope these responses were able to answer your questions.
Technically no, but they do provide one starting data point for my intuition so it's useful all the same. Thank you for your thoughtful response. : )