Is your character any manner of spirit, youkai, demon, or otherwise inhuman being? Does your character share their body with any manner of spirit, youkai, demon, Persona, etc? He is human for all intents and purposes! He just has magical/spiritual energy that'll read a little dark/yin energy if that can be sensed.

If your character is human, is your character capable themselves of sensing spiritual energy, youkai, demons, etc? Further, do they have harnessable spiritual powers? He can! Not sure about harnessable. Perhaps? It's a little murky.

Does your character carry any manner of object or artifact that might ping as being related to spirits, demons, the underworld, etc? Typically yes, but not as he first arrives in GP. Eventually, he'll regain his flute, chenqing, which pings as slightly demonic.

Are you okay with Matoba sensing your character's inhumanness/their ability to see/their magical or spiritual artifact? Yep!

Are you okay with Matoba testing your character's inhumanness/their ability to see in minor ways (such as asking intrusive questions/making references to things that require special perception/using magic on surroundings to see if they sense it? Yep!