"There actually isn't anyone on the list who exclusively has a defined power to destroy continents. They're all just characters with massive attack power..."
Well then let me ask to you, how many characters do you know who had a specific ability of destroy a mountain, that doesn't involve the raw power or shear strength of the user?
I mean, with Universal Destruction page there are several characters that can destroy an universe without using energy blasts or physical strikes, like Enrico Pucci from Jojo or the Cosmic Cube from Marvel.
But even they don't have the specific ability to destroy a universe, Enrico Pucci can accelerate time so much that the universe get destroyed, while the Cosmic Cube can instead warp reality itself.