Gods are not demons: they can not be "summoned".
You go to Asgard.
yes You can
Aesir
The Aesir.
Odin was god of the Norse.
If you mean which group of gods they are part of, then the answer is the Aesir. The reside in the Aesir home, Asgard.
Odin has this role in Norse mythology.
The Aesir is the group of Norse gods who live in Asgard. There are many, but the main ones would be Odin, Frigga, Freya, Thor and Loki.
When your in a fight, playing as Lightning. Go to tehcniques and Summon Odin should be there, but you have to make sure you have enough TP. You need to have at least 3 TP to summon.
Drax the Destroyer.
No, Odin is Thor's father.
Odin was the father of the Aesir (Norse gods) and lived with his compatriots in Asgard (Home of the gods). He divided his time between tending to matters in Asgard, visiting Midgard (disguised as a man) and lording over his Einherriar (Chosen slain) in Valhalla (Otherwise known as Valhall), where he was known as Valfather.