I’ve recently had a little revelation about Loki during the Avengers period. Maybe I’m late to the party, but here’s my takeaway:
If you remember in the very beginning of the movie, Loki was limping/having trouble walking. If not, here’s a gif-set taken from this post which also goes into detail about Loki’s pain in The Avengers.
Well, fast forward to Stuttgart Loki. Not only was that a whole look, but part of me feels like the cane was necessary and not just an accessory:
The reason I say this is because his limp from earlier reminds me of back pain and how crippling it can be without the help of a cane. In conclusion, I think that his cane was not only used for this badass scene:
...but also simply out of need.