Hi Heather! Absolutely! I'm terrible at plotting, admittedly, but I think Regina and Emma are in an... Interesting place for jumping off of, considering the end of S3, and we can figure out something with Hans as well. :3
Yes, I am! Here is a whole bunch of resources about rping on Tumblr. I'm personally an indie rper, so I'm not associated with a game or group. Just as a warning, in many ways, Tumblr rp is pretty visually oriented (similar to IJ, but more so). You're expected to use a different icon or gif with every reply you do, you generally need a pretty theme for the blog, many people use HTML code in their replies to make the text smaller or add special characters, etc. They're not requirements, but like on IJ, you tend to reach a wider audience by following trends. (Pretty themes = pretty journal layouts and so on.) It might be hard to organize that kind of thing on mobile.