From the 17.9 notes
This is something rolepalyers have been asking for years, almost as long as a social tab, so I am sure a lot of people will be very happy about it.New /rp command for roleplayers. This command will add visible characters to your name tag so that other players can see that you are currently ‘in character
Personally I don't see it as making a huge difference. The issue for me has never been about finding other roleplayers. The real challenge for me is finding new things to roleplay about. But still, one more more little present from FC to us roleplayers, one I thought I'd never see!