Thanks for the additional excellent drawings and illustrations!
The Fenris Wolf is a creature of Asgardian origin, said to be offspring of Loki and the giantess Angrboda.
The goddess Iduna walks the forests of Asgard carrying a bundle of golden apples. These "Golden Apples of Immortality" are for All-Father Odin/Wotan, and Iduna brings them to him every year. Along her journey she meets Haakun the Hunter. Haakun greets her warmly and tells her to go in peace.
As Iduna continues further down the path, Fenris sees her, and transforms himself. Iduna next comes upon "a frail stranger". The stranger offers Iduna protection along her journey, but she declines the offer. The stranger takes a strong interest in Iduna's basket and begins asking her questions. She quickly grows suspicious, saying he his hands seem so grasping and brutal, and his voice sounds like that of a beast. She finds his manner sinister-frightening, and says his eyes burn with hatred-with pure savagery. She then discovers that the stranger is actually Fenris the Wolf God in disguise. Fenris shape shifts into his true form and attacks her. Haakun the Hunter arrives and drives Fenris away with his enchanted battle axe, causing the Wolf to shrink in an attempt to escape. The axe pursues Fenris and finally strikes him, spiriting him off to the shadowy land of Varinheim.
In Norse mythology, Odin had the dwarfs forge the chain Gleipnir ("deceiver" or "entangler"). It appeared to be only a silken ribbon but was made of six wondrous ingredients: the sound of a cat's footfall, the beard of a woman, the roots of a mountain, bear's sinews, fish's breath, and bird's spittle (which explains why these things are not found today). When it came to binding the Fenris Wolf, Tyr lost his hand in the process as the Wolf would only allow the chain to be put on if one of the Gods put their hand in his mouth.
It is prophesied that when Ragnarok occurs, Fenris will devour Odin. Hela one time unchained Fenris Wolf to bring about Ragnarok only to be thwarted by Thor.
Here's another b+w depiction of Tyr and Fenris wolf.
