Each City was named after their founder: Emily Paralis, Fabio Celton, Hector Velamoro, Sarah Helthly, And Mira Molfel
Celton is the Breeding city. Although the Breeding System is now shut down they are still known for it.
After the wall came down, Celton shut down their breeding facilities until a new volunteer-based system came out.
Paralis is known as the city that is ruled "by the people, for the people". They elect a new president every two years who's focus is to make life in Paralis blissful.
Velamoro is the city of royalty. There is a king, queen, etc. Everyone dresses like the medieval people did. Although this medieval city seems old-fashioned they are up to date with health codes, plumbing, and electrical privileges.
Molfel is known for their inbreeding. The city started off very small so it wasn't long until everyone living there was related in some way. They strickly prohibit siblings and other immediate family getting married.
Helthly:
The City of Hope. No one is able to enter unless their a citizen and have a citizen card. They are advanced in everything from health care to schooling to growing food, but they like to be secluded and safe in their tower.
Betweenes are people who have been kicked out of their home cities and exiled to live in the barren wasteland that stretches out between the cities. An exiled prince from Valamero discovered the Betweener HQ building and created the Betweeners. They are known as "Pirates" because they raid cities and kidnap people to steal their medicated blood.