Wild guess about the white witch character at the top left, Chino's mom and pre-grandfather Tippy.
I think it's the writer lady that was friends with Tippy when he was a man
That would be Aoyama Blue Mountain, who is right below the White Witch.
Volume 6, chapter 6 basically confirms that whitey in the upper left is Chino's mom and pre-possesion Tippy.