Shyvana Rework Idea
I feel like Shyvana's passive, and the passive portion of her Ultimate should be swapped.
This would mean she has Fury at all points of the game. I believe that her Fury should be managable, meaning it will fall off when out of combat for too long.
I would also make some/all of her abilities or base stats scale on her % of Fury.
I also believe making her Fury something that can drop off out of combat would make for a necessary adjustment for when she is able to ultimate. Instead of needing 100% Fury, it should become available somewhere around 80%, and increases her Fury to 100% instantly.