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Basic Trope: A Prophecy Twist where a character's prophecized invincibility has an unforeseen loophole.
Straight: Incisor declares that no princess can defeat him, only to be beaten by a Tomboy Princess.
Exaggerated: An Amazon Brigade of Tomboys challenges Incisor to a fight and wins.
Downplayed: The prophecy says "no princess", singular. Two princesses gang up on Incisor.
Justified: Incisor comes from a world where princesses are supposed to be rescued by a handsome hero.
Inverted: A prophecy seems to state that anyone with dominion over the branch of magic that opposes Incisor's powers, can kill him, but if you follow the logic it actually says he's invincible because he can use light and darkness powers at the same time, therefor neither black nor white magic can harm him. Also, if you read it carefully, anyone born from royalty cannot defeat Incisor.
Turns out the prophecy was made up by him as a means to lure out the Tomboy Princess.
When the prophecy said "no man", it really did mean "no human" as expected.
But a different prophecy does allow her to defeat him.
Zig Zagged: The prophecy says no man can kill the dark lord, so they get a woman to kill him, but then it turns out she's actually a man, but then he uses a spell to turn himself into a woman, but in the process of stabbing the dark lord the spell wears off...
Averted: There is no prophecy protecting Incisor. Let's get him!
Enforced: "Great, we made this villain too powerful for anyone to defeat. Quick, throw in some loophole prophecy, then we can kill him off."
Lampshaded: "A prophecy is protecting Void 4. How can we defeat him?"
The villain wants himself to be defeated only by someone clever, so he has the circumstances of his death worded so that someone who thinks about it real hard can figure out the loophole.
The dark lord wants a wife, but decides the only woman good enough for him is the one that dares meet him in battle.
Alice has always wanted to be in the army, and uses the knowledge of the prophecy's loophole so that they'll let her in.
Defied: When hearing a prophecy about his death, the villain keeps leading on the prophet to alter his wording so that he is truly invincible.
"So what if no man can kill you? You can still be killed by women, children, animals, poisonous plants, disease, random accidents... Not to mention there's nothing that states they can't injure you or drive you off."
"This prophecy you're making for me better not be one of those annoying loopholes ones. I don't want to be like Lord Vortanok and his empire, who thought he was invincible and then was killed by a pigeon."