This covers most of the Nordic gods, but there are many more.
Loki is not technically related to Odin or Thor. He is not really Aesir either. Loki is a blood brother of Odin through an oath, not birth, and is a chaotic balance to Odin’s order. He isn’t related to Thor in any way other than his friend. (Disney took some liberties with the Eddas, but I still love Disney).
If you’re looking for gods for witchcraft, you may want to look at The Crooked Path by Keldon. He talks of The Witchfather as a deity/demon that works with witches.
Loki is also believed in Norse tradition, to be the god of Witches, whereas Odin is the god of the Mage.
What’s the difference between Witch and Mage? I kind of use Disney for this, The Sword in the Stone cartoon. Merlin is your mage and Mad Madame Mim your witch, kinda sums up Loki 
