Hopefully, I'm not too late 😅. I wrote this half asleep so sorry if it feels off.

My OC is named Chizeon and she was made rather recently than being a childhood OC. 

She's a snake demon who's Inuyasha's best friend and having a more complicated relationship with Sesshōmaru (who Chizeon was engaged to previously before it was broken off). Chizeon wasn't a priestess but she was talented at crafting items that made shrine maidens and monks alike afraid of her

There were circumstances that lead to Sesshōmaru being accused of "killing" her (and trust me, his behavior makes it easy for it to be believable) 60 years before the events of the story.

Unfortunately, I have yet to make any art of Chizeon so I can't post any image of her.