The Aesiran are still largely unknown to us. Even the decades after Wars End have not changed that. They have not turned away Earth diplomats sent to their borders, but have not invited them any closer to their homeworlds. They are kept quite comfortable on the border worlds with the other races that fill them, and the locals are happy to talk with them about whatever they want to talk about. But the Aesiran do not appear to have a diplomatic service of their own. If they want to talk to us, they generally skip the diplomats entirely and send a representative directly to Earth to deal with our heads of states. They have even offered to take the diplomats home on these trips, much to the chagrin of the various diplomatic services of Earth.
Happy Thanksgiving to all my friends and family all over the world. May you have a good day and may you eat and sleep well.
The Aesiran have a reputation of providing shelter for Races of Humanity displaced by war. Usually this involves granting shelter to anyone who reaches their borders. Rumors of their reaction to the fall of Arnami Prime are instructive though. The Arnami received both direct aid and shelter after the Shang succeeded in initiating a new ice age on their homeworld. Aesiran forces guarded their evacuation fleets, their new settlements, provided them shelter inside Aesiran borders, and otherwise did all it took to give the Arnam a fighting chance to survive. Their patrols even began to maintain order in the Arnami Sector, and it is one of the few sectors of space where they maintain bases outside their normal borders to this day.
The Aesiran fought generally on our side during The War. They sent no major fleet assets to Earthspace though, and spent most of The War fighting the Shang and Roderan far closer to their home. Earth has heard little of these distant battles, but some rumors have reached us. The place the Aesiran call the Vigrid Nebula hosted the largest battle we know of. It is a rough patch of space on their far borders, filled with newborn stars, planets, asteroids, and many other stellar phenomena. Some rumors say the Roderan and the Aesiran fought with such titanic weapons that entire stars exploded, but most historians doubt these more spectacular claims. What little we do know is that both powers largely drew back within their borders after that conflict ended.
The Aesiran are generally a larger race of humanity, with the examples we have seen tending to average far heavier and more massive than Earthborn humans. They are not as large as the Roderan, but are well outside the human normal otherwise. They also prefer colder climates outside the general definition of livability by most humans, but can operate in most normal environments. They are culturally carnivorous, and most of their food revolves around fish of some kind or another. Even their warships leave home with living fish in their water bunkers so they can eat fresh food no matter how far they travel. It is with great honor that they to give you fish from their own bunkers. They expect you to eat it and enjoy it.

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