The Akavir, more commonly known as the Akaviri, were and perhaps are a mysterious humanoid race from the continent of Akavir. They spoke a language known as Akaviri. There are several conflicting and contradictory reports about the Men of Akavir, including that they died out long ago, that they were eaten by the Tsaesci, or that they are in fact the Tsaesci themselves.
It is not known exactly where the Men of Akavir came from, but some say they may share a common ancestor with the settlers of Tamriel (Atmora). Wherever they may have come from, they have long since died out as of the present, as they were eaten long ago by the Tsaesci; though the word "eaten" may not refer to literal ingestion, certain sources seem to imply that humans, or humanoid beings, were actually just assimilated into the Tsaesci Empire. The Blades seem to hold a very small resemblance to Akavir culture. The Blades, which were thought as the bodyguards of the Emperor, originated as Akaviri crusaders who invaded Tamriel for obscure reasons in the late First Era. They appear to have been searching for a Dragonborn - the events at Pale Pass bear this out - and the Akaviri were the first to proclaim Reman Cyrodiil as Dragonborn. In fact, it was the Akaviri who did the most to promote his standing as Emperor (although Reman himself never took that title in his lifetime). There is no known hereditary connection between Tiber Septim and any of the previous Dragonborn rulers of Tamriel.
The Akaviri are believed to have been much like other human races in terms of physiology and appearance. While it has not been confirmed as to what color their skin was, it is believed that they looked like all the other races of men in terms of shape.
Little to nothing is known about the culture of the Men of Akavir. Cloud Ruler Temple, in Cyrodiil, is based on Akaviri design, as well as the armor and weapons of The Blades. The Akaviri also seemed to have used katanas, something not seen by any other race.
Little to nothing has been preserved of the culture of the Men of Akavir. The Red Dragon, the symbol of the Septim Empire, came from the Akaviri. During the invasion of Tamriel in 1E 2703, the Akaviri built Sky Haven Temple in Skyrim as an outpost for their Dragonguard.