Can't say I am not interested within the possible construct of a [s]Demon Souls[/s] Re;Zero roleplay. Though a few semantics, in my opinion, would be preferred to be addressed:

1) Will there be canon characters within the world or is it a "blank slate" we can shape in most regards, besides of course the aspect of the Witches and their lasting effects on the lore of the world.

2) How will blessings and the like be calculated? Would that fall under the "magic" tab, or is that some other tab, as Blessings, for the most part, are a way for the humans of the world to combat against the witches' followers and creatures. [Ie someone like Reinhardt, from being from the family of Van Astora, is given hundreds of blessings which makes him one of the strongest single characters within the series, even though Subaru is still technically the "strongest", though his strength is more akin to folding a piece of paper 100 times to reach the moon or some other impossible feat, but he still folds the paper than many times]