[@Hawthorne]

Naturally yes he will remain a mystery up until the first few posts. His presence will become known as the story begins with everyone assembling in the Holy Kingdom. 

In my mind what I was imagining is 
1.) Everyone meets in the Holy Kingdom for the Festival under the pretense of either wanting to go, or they heeded the special vision only they had to go and find the Seraph. 
2.) Very shortly after everyone makes their initial posts and the festival begins the story will kick off and the Seraph will become known. 
We go from there. 

I love questions and I’m open to any sort of direction or feedback. I want this to be a fun and interesting journey for all of us after all :D