I did not particularly like the movie Thor Ragnarock. But there were a few things about it I really did like. I was a HUGE fan of the way they did Fenris, and the fact that they included him.
I was disappointed though, that he had no connection to Loki whatsoever. It made sense for him to be with Hela, and it's not that I wanted him to actually be Loki's son (like he is in mythology), but I would have liked a nod to it. I felt like they should have at least had some kind of moment.
So here is my version of events, where Loki has the capacity to tame Fenris, and take control of him away from Hela.
I mean, wouldn't that have been awesome? If, instead of the Hulk killing him, team revengers had been able to use him by turning him against team Hela instead?