In Old Norse, áss (or ǫ́ss, ás, plural æsir, feminine ásynja, feminine plural ásynjur) is the term denoting a member of the principal groups of gods of the pantheon of Norse paganism. They include many of the major figures, such as Odin, Frigg, Thor, Baldr and Týr. They are one of the two groups of gods, the other being the Vanir. In Norse mythology, the two are described as having waged war against one another in the Æsir-Vanir War, resulting in the unification of the two into a single tribe of gods.
Odin is the greatest and oldest of the Æsir. He is god of wisdom, victory & magic. He is the Allfather of the gods, the husband of Frigg, and King of Asgard. He is the son of Borr and giantess Bestla. Borr was the son of Buri (the first god) and a giantess.
Thor is Odin's first and oldest son by Jörð (the Earth giantess). His is the god of thunder. He is married to Sif.
Baldr is Odin's second son and son of Frigg. He is the god of light and beauty. He is husband of Nanna and father of Forseti. He is killed by Höðr (tricked by Loki) and avenged by Váli.
Týr is the god of war and many warriors pray to him for victory in battle. His hand was bitten off by the Fenris Wolf. He is the son of Odin and the goddess Sága.
Bragi is the god of poetry and skaldship. He is husband of Iðunn and son of Odin and Frigg.
Höðr is the son of Odin and twin brother of Baldr. Höðr was blind. He killed Baldr unknowingly (he was manipulated by Loki) and was in turn killed by Váli.
Heimdallr is the son of Odin and the nine wave goddesses, daughters of Æsir the sea-giant and Ran. He guards the Bifrost bridge and at Ragnarök will blow the Gjallarhorn to signal the beginning of battle, where he will kill and be killed by Loki.
Ullr is the son of Sif and an unknown giant. He is step-son of Thor and is god of skiing and archery. After Skadi married Njord, the sea god, she was unhappy and left for her wintery mountain home. She eventually married Ullr.
Hœnir is a son of Odin. After the Aesir-Vanir war, he was sent to Vanaheim to become chief of that pantheon of gods.
Hermóðr is a messenger god and son of Odin. He was tasked with riding to Niflheim to beg for the return of Baldr to the realm of the living.
Víðarr is the son of giantess Gríðr (violence) and Odin. He is the second strongest asa.
Váli is the son of Odin and Rindr (a Russian princess). His sole purpose on Earth was to avenge Baldr by killing Höðr.
Forseti is the son of Baldr and Nanna. He is the god of judgement.
Loki is actually a giant (son of giant Farbauti and giantess Laufey), but blood-brother of Odin. He is the trickster god and god of fire.
Vili is the brother of Odin and god of intelligence and the sense of touch, giving these to the first humans (Ask and Embla).
Vé is the brother of Odin and god of countenance (appearance, facial expression), speech, hearing, and sight.
Máni is the god of the moon and was created by Odin and his brothers.