Fenrir can be seen behind Fenris.
|First Appearance||mentioned only (Ragnarok)|
It is unknown where Fenrir fits into the scheme of things as both Fenris and Frigg hint that Fenrir was a part of the Thousand-Year War but that doesn't necessarily mean he participated in the war. It seems Fenrir was very familiar with Baldr as the wolf had been to Baldr's temple Breidablik (since Fenris recalled it being very grand when she visited the ruins in A.W. 996) and Fenris literally threw herself into the arms of Baldr's reincarnation when she found him.