The Magicians re-imagined as Olympians.
I am a huge fan of Lev Grossman's book, the tv show, as well as Greek mythology. When I was younger, my mom always said she loved Greek mythology because the gods were so flawed and so human. And as a result of this re-imagining, I now hold some of the gods--especially Zeus and Hera--in higher estimation. I would sooner trust our flawed Magicians to take over Olympus.
The keys are not all assigned to the same people as seen in the various promos, but the characters do all have ties to the keys I have assigned them to here, and I think they go well with their new roles. (For example, Kady's version of Aphrodite balances the golden apple of discord with the unity key, which she played a part in retrieving.)
I found out about the contest late, but it was fun delving into this with a limited timeline. And it so happens that my husband and I will be working on our Quentin/Alice cosplay (characters that we also specifically identify as in real life) for next year's conventions. Long live the Magicians!