RU1's population consists mostly of humans. This world was once much like OU1, but a cataclysmic event rocked it so hard that the contenents converged into one landmass. Upon this, a massive city network has been built, with barely any regions being left out of it.
The cetral city is built upon what was once the United Kingdom and France, and as such, the accent there has been derived from it. As you go further out into the outskirts, the accents change depending on what the country had once been.
Almost the whole city is art orientated, as art was one of the main things that brought joy in the times of hardship. There's street art everywhere, stage plays, street performances and music. Being a creative is a very common job.
There are refugees from other worlds living here. Mostly those who had to escape a dying world and weren't accepted anywhere else. This has brought in new species and new art, and overall the city people are happy to have them there.
Earth
For some unfathomable reason, a glitch occured here that caused every human to switch bodies at random times. When the glitch first happened, it was only very few people who switched, but it soon picked up and caused mass panic. It was never solved and people have continued to switch bodies, the times ranging from switching every few days to every few years from person to person.
Systems have been put in place to help. A self driving transport system has been implemented to prevent accidents due to switching and a worldwide programme is in place to locate and relocate those who have switched and need to get back home.