Hmm...  I have no clue what the other nations are like.  I may go with the following app I made or decide to set up on Sapia instead where I would make something much, much more alien than these loose relatives.  I am assuming that the Void War caused some outflow of refugees to other countries in other parts of the world.

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Name of Nation: The Greater Gestalt of the Four Vital Streams (Or simply The Gestalt)

Nation Characteristics: Theocratic Republic with with a deeply, deeply ancient system which is notorious for its alarming persistence even in the face of modernity.  They have incredibly ancient ties to the land and have basically existed forever if you go with their mythology.  They had been highly successful in their modernization camapigns due to their highly centralized, authoritarian system of government codified through ancient texts where reality and myth have no boundry.  Despite their insular foreign policy, they are very welcoming of absorbing outside species to the Gestalt.  The Greater Gestalt has managed to make very incremental progress towards being a modern society, but they are still a society based around manufacturing than anything else.  Internally, they have problems with a range of radical resistence groups, but for now they have managed to keep some semblance of valuable stability.  

Their society is primarily represented by the Great Mind, who is a male Sopor picked by a council of Sopor to act as the conciousness of the Gestalt and these male Supor are regionally elected from the different parts of their ecumene by local landlords.  The underclass, who are effectively serfs, do not get to participate in elections and tend to be given bread and circus.  This arrangement has caused numerous internal conflicts which the upper classes have had to crush multiple times, often with incredibly totalitarian methods.

Nation Location: The heavily forested region w/ multiple rivers, lakes and presumed swamps in the lower left part of the map.  Their civilization holds its legitimacy on the control of these four huge river systems and their capital is situated around the lake.

Nation Initial Population: 112 Million due to the Violet Salt, river beds and such.

Species Name: The Sopor

Species Characteristics: 
The Sopor are the main species of the Gestalt, even if they have come to include other species as part of their empire due to their special uses to the Greater Gestalt.  They are humanoids of varying shape and size with the universal characteristic of being very pale skinned.  They also have large arm flaps used for gliding, as many Sopor are arboreal by nature and this shows in their climbing oriented infrastructure.  The Sopor have extreme gender dimorphism as well.  

Male Sopor are usually very big, tetrapodal creatures who while more mobile when young, develop to become semi-sessile beings as they age and breed extremely frequently.  These males make up the upper echeleons of society and tend to have other males killed in order to keep their positions.  Spacecraft tend to be piloted by a specialized caste of male Sopor, as they were during the age of sea ships. It's all the same to them.  

Female Sopor meanwhile, take on many, many more roles be it argiculture, construction, basically everything the male Supor don't do and stay mobile forever.  Male Sopor that don't age tend to end up looking very much like female Sopor, indeed when young the gender isn't actually determined.  It is only when they get older that the male Sopor become their adult form.

Side Chosen in Void War: Neutral
The Gestalt was never one to care for such alliances with outsiders.

Technological Level: The Gestalt is an industrial society despite their more naturalistic roots, mainly because in their mind, their pollution and ravaging of their own forests is just another aspect of nature and view their whole society as just some huge animal anyways.  It is a polarizing issue within the courts, but publicly most simply don't care especially as outsiders bring it up.  The Gestalt has built a strong industrial base with spacecraft and is in the middle of building an orbital city.  Their strong industrial complex brought forth from their utilization of a huge population boom and heavy investment into spacecraft does mask how in many other areas, they are profoundly backwards such as in medicine or infrastructure.  Int erms of weaponization they haven't gotten much further than using ballistics.  Their space prescence is rather sordid an affair, with the Sopor in space usually acting almost independant of their society on the ground due to a poor communications system.  There has been efforts to throw a colony ship at another planet as a "means to propogate the Gestalt", but no such projects have come to full fruition yet.

Special Resource: Violet Salt - Violet salt is a notable material whose agricultural applications have been used regularly by the Gestalt's Council for ages as a means of keeping the people fed with these fertility enhancing minerals which have also found use in trying to make a space city.  Violet Salt is what is responsible for the surging populations within the Gestalt, for they have become increasingly effecient at mining it from the mountainous regions where it is found.