I've been wanting to participate in an RP of this series ever since I went through my first playthrough of SMT IV. I haven't found any RPs for it so far though, so I decided to put this up to see if anyone would be interested. I also am looking for a storyline for the RP if it ever does get underway, so here's a good place to toss around ideas. 
The "gameplay" will revolve around demon summoning instead of Persona summoning, so people will be able to recruit or "invoke" demons. "Invoking" is basically the same thing as fusion, but instead of fusing demons together to create a new one it will be more of sacrificing demons whose life force can draw forth a particular demon. That makes more sense to me.
 I'd like for the RP to start in "media res" (in the middles of things), that way there can be an issue that needs solving underway immediately so we can all just jump into action, interaction, etc. Also, this would allow people to start out with whatever demons they choose so long as it's not something like the Ancient of Days, Four Archangels, or "Devils" (Lucifer and Satan). Makes it more fun that way, because I dislike the whole "start lowly but grow stronger" thing. 

Also, quite honestly, I'm new to the series since SMT IV is my first SMT game. A GMing partner to run things would be nice to have, so long as they have pretty good knowledge of the series and whatnot Anyway, here's the suggestion. I'll see if this garners some good interest.