I can second Fate. Preferably something semi-original(as in not a Grail War covered by canon so far) so you can be a bit more flexible. OR Tsukihime, same setting either way. Melty Blood could be fun. ^^;

Also, like I said, you can, if you want, allow people to GM settings you don't think you know well enough to do so with.

I can volunteer a few different original settings(Urban Fantasy or Fantasy for the most part), there's always Dark Souls or Bloodborne, um... Out of anime I've watched [i]recently[/i] I'm not sure I can think of any that would actually be good ideas to try and do in an RP.

... Maybe something Raildex? It's been a while since I watched that but yeah. Re:Zero is probably a bad idea.