2. I can't find information on how Angels/Demons/God Machine shit and Changeling Masks interact (outside of people claiming that they think that they've seen information on a some wiki somewhere, the books seem to leave it purposefully vague/faintly conflict) so I'll use the answer that I'll have more fun to play with, and I'd prefer if he couldn't see through their Masks.

Does he have any supernatural senses like aura reading that might offer clues like "she sparkles weird"?

3. I'll think on it and get back to you!

4. Babysittingggg