What's a good RP I can do? I want to do something mystical, but I can't think of anything. Anyone have any suggestions?

Maybe a fairy type of thing, they are mystical right? Like fire, water, ice, lightning, dark, light, and plant fairies. You would have to make a up a good intro to back up the role play though. I don't know, its your choice really. :)

If you are talking of a mais mature fantasy, you could try out the Heir of Iron and Blood, it's based on Game of Thrones. Kind of a Midieval story with dragões and Knights. Here's a link if you're interested. link
You can cadastrar-se por creating a character article, with examples in the RP.