-shrug- It isn't particularly hard to RP it out in my experience. The majority of the issues enter in when combat is involved, which Ra won't be involved in, so it's not too bad. :)
EDIT: Mei Terumī has two Kekkei Genkai. Ra got her Chigoku Inkan through extensive surgery that left her incapacitated for the best part of a year and a half or so. That section of the history was omitted because it references things that can't happen in this universe. c: