Odin was the god of war. He stormed around on his hellish eight legged horse
Thor was the God of thunder, also the most popular and well known of the Norse Gods. He had a short temper however was not out to harm, he was a reflection of what most Vikings thought was important: Strength, Determination and Respect. In his simpleness he had one quick way of fixing things which he felt got in the way of justice, he would kill them with his hammer.
Freyja was the goddess of love and war, originally of sex. She had the ability to trasnform into a bird by wearing a falcons skin.
Frey was a fertility God. His Sister was Freyja the Godess of love and war.
Loki was half god, half fire spirit. In a sense this character was the devil of the Viking's religious views as he would cause the over Gods trouble and be disrespectful.
Idun was the Goddess of spring and immortal youth.
Sif was the goddess who married Thor and bore his stepson (by Odin), Ull. The vikings (and their gods) admired golden hair, and she was exceptionally proud of hers, so Loki cut it all off while she was asleep.
Hel was a goddess (or a monster), a daughter of Loki and Angrboda, who ruled over Niflheim, which was the land of the dead.