The enemys of the gods were the titans and those who worked with them
Yes, the Vikings were the Norse "pirates".
Odin is generally considered to be the leader of the Norse gods.
Norse gods were broken in to Aesir or Vaenir.
Odin is generally considered to be the leader of the Norse gods.
That Woden (Odin) was king of the Norse gods.
There were two races of gods in Norse mythology: Aesir and Vanir.
Asgard is usually considered the main abode of the Norse gods.
Norse gods
Some Norse gods were Odin, the chief god and Thor the god of thunder.
If by "Race" you mean skin colour; the Norse gods were caucasian. There were no dark skinned peoples living in Scandinavia at the time. Otherwise, the Norse gods, as a race were called the Aesir.
The Norse gods fell due to Ragnarok which was a series of events sending in a giant battle in which the major gods were killed.