Board Thread:Spoilers!/@comment-26159109-20160301190120/@comment-27060727-20160302223820

ItachiIshtar wrote: After some thinking, it could really be Mufasa and Scar. Yes, I know the descriptions might seem off, but this is OUAT, and they occasionally do their own twists. Their twist could be that Mufasa is a bit of a tyrant, and that plays a role in Scar wanting to dethrone him. I could totally see them presenting Mufasa and Scar as initially human characters, but as a nod to The Lion King, we'd see them cursed as lions at one point or something like that. Like, Robin Hood was human in lore but Disney made him a fox, and OUAT went with a human.

The characters that they bring on are usually iconic. I don't see them going with two brothers that appear in some old fairytale that no one has heard of. I don't know enough fairytales/legends to give a good guess, but since they are appearing in the finale, which will conclude the underworld/Hades arc, maybe it's still something to do with greek gods?