Straight: In a world where Elemental Powers are commonplace, everyone who has the capability is restricted to one element. Morgana, on the other hand, can use multiple elements.
Exaggerated: Morgana can channel and use all the elements — including some that nobody else in the entire world has ever been able to harness before.
Downplayed: Morgana can use all elemental powers, but her strongest is still one element. Although nobody else can use all of them, she's still weak enough that he doesn't consider any element he hadn't practised with functional enough.
Everybody thinks in a certain system, such as astrological signs they were born under, to help control the element. Morgana, who has no idea when they were born, never had such a restriction and thus could use more powers simply because she didn't limit herself.
Subverted: Morgana appears to use all elements, but it was her friends helping her from behind the scenes.
Morgana soon discovers she can actually control other elements — she just wasn't aware of it before. After all, she'd already discovered her elemental speciality, and had no reason to suspect she'd be any different than anyone else.
Morgana's friends used there elements behinds the scenes to hide the fact that Morgana was not skilled at the other elements.
Parodied: In a World where ice cream is only ever sold with one flavour per box, Morgana invents Neapolitan ice cream, shaking the dessert world to its foundations.
Zig Zagged: While Morgana is able to control more than one element, this turns out to have its own limitations: she can only use one at a time, having to mentally 'switch' between them. Eventually, she grows out of this restriction. Meanwhile, others discover how to tap into their potential with other elements; while most remain talented with only one power, several learn that they're talented in two or more spheres.
Averted: Morgana's powers work the same as everyone else's.
Enforced: In a video game where Morgana is the only playable character, forcing her to use only one element like everyone else would bar the player from using any other elements.
Lampshaded: "Wait, you can use wind AND fire?... HAX! I CALL HAX! CHEEETEEER!"
Invoked: Morgana, realizing that he would never be a "hero" without some sort of gimmick that he could call a "hero's mark", decides to try and break tradition to find something he can use that others would call his "hero's mark", and it ends up being practical.
Conversed: Fans aruge weather or not Morgana's ablity makes her a mary sue.
Deconstructed: Since she doesn't have to deal with the same restrictions as everyone else, Morgana becomes very Prideful and overconfident. Others also become jealous and resentful of her talents, or grow suspicious of them — after all, such raw power could easily be abused... In fact, she is also targeted by Smug Snakes and Manipulative Bastards for just that reason.
Reconstructed: Morgana learns to be humble and use her abilities responsibly.
Plotted A Good Waste: Turns out that Morgana's actual power is warping reality — which was mistaken for her being able to control multiple elements, as she was unaware of her true sphere of influence.