TechniccaRuled by Ea, Technicca is the kingdom of hi-tecs, the descendants of the ancient civilization that once ruled the world, but was forced to hide underground and since then had to survive inside deep caves. In their early underground days, they managed to use the remains of their resources to change the caves into a technologically advanced underworld city and had big plans on expanding it all under the continent, alas generation after generation, much of their ancient knowledge was lost, so the expansion was no longer possible, but this technologically advanced city still stays to the present day.
One thing tecs could manage to preserve from the ancient world is the old fashion, when bare legs and feet weren't seen as something special but bare arms and hands were considered as pretty sexy. In the modern world it's the opposite, but in Technicca it's common to see civilians walk around in nothing but leotards, which is sort of equivalent to the modern t-shirts, while the guards and some more formal people typically wear bodysuits, which can be seen as equal to the modern business suits, police uniforms, etc.
Although hi-tecs weren't able to re-learn their lost secrets, a lot of their ancient technology is still technically alive and functioning well, in particular the large facility that they call the Temple of Scorpio, which is used today to create androids, the complete humanoid replicas with metallic bones and artificial skin. These man-machines are used as workers, servants and entertainers. Entertainment is the top priority in Technicca because in the underground they don't have the sun, the beaches and the forests that can soothe the spirit, so they have to create the relaxing environment all by themselves.
In many ways hi-tecs are similar to human teens, as they have the bodies that don't mature past the teen years, so even a 50 years old looks like a 18 years old human. Their bodies are very flexible, to the point that contortion practice is more common than jogging or push-ups. Technicca's furniture is quite unusual as hi-tecs are used to rest in a deep split, backbend or frontbend, rather than in the sitting or laying positions, and since babyhood they learn to sleep in a triplefold.
They also have quite youthful minds, so they're quite a bit scared of the outside world, which in their opinion is full of giant and ugly forms, referring to the normal human adults. Therefore they try to keep their eyes on the outside world and their other top priority is espionage. They're commonly seen as the Yokai ("supernatural monsters") by the people of the overworld, because of their technological advancement, extremely limber bodies, abilities to hide and the frightening masks they usually wear on their missions. As the Yokai they're part of fairytales and the majority of the world is yet to find out that they're real.
Technicca is a closed city, it cannot be found by travelers as it's guarded by the ninjas of Guenii thanks to the mutual agreements between the two kingdoms. In exchange for the protection, the ninjas receive the cool black bodysuits, as well as the limited access to Technicca for studying the espionage techniques and flexibility improvement.
Thanks to A.F. for helping with ideas ^^