Heimdall
Heimdall was known as the White As ("As" is singular for Aesir). Heimdall was the son of the Nine Waves (nine giantesses, who were sisters; this meant that Heimdall had nine mothers). The Nine Waves were the nine daughters of Aegir.
Heimdall was also known as Rig, creator of mankind or the human society. He was known also by two other names – Hallinskidi and Gullintanni.
Heimdall was the warder of the entrance to Asgard: the rainbow bridge called Bifröst (Bifrost or Bilrost). He dwelt in his hall Himinbjörg (Himinbiorg – "Cliff of the Hills" or "Heavenly Fall"), at the edge of Asgard, near Bifröst.
Heimdall had super-sharp eyesight and hearing. He was the never-sleeping watchman whose duties were to prevent giants from entering Asgard. His sword was called Heimdall's Head (Hofund). He also possessed the horn called Gjallahorn. When Heimdall blew Gjallahorn, it would signify and warn the other gods of the coming of Ragnarök (Ragnarok).
When Loki stole the Brísingamen from Freyja, it was Heimdall who recovered the necklace for the goddess.
Like Odin, Heimdall also drank from Mimir's well. Heimdall gave up one of his ears.
In the final confrontation between the gods and the evil giants, Heimdall would be riding his horse Gulltopp and armed with his sword Hofund, Heimdall and Loki would kill one another in the fighting.