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The trope is endemic to fantasy literature. Especially middle grade and YA fantasy literature. How many times have we gone through the old song and dance of a single person who is “special,” who feels like an outsider or doesn’t fit in, and turns out to have special powers or is the long-lost heir to the fairy throne or some other trite nonsense that hangs the fate of the world on the decisions of a single hormonal teenager? (Nostalgia Critic’s review of Percy Jackson and the Lightning Thief covers a lot of the issues with this trope of “Wowed Teenagers” quite nicely.)
Now, to be fair, a lot of people do connect with this base character type, and as long as the story does something interesting with it, there’s nothing inherently wrong with the trope. For people just discovering works featuring that character type, it’s something new and unfamiliar to them. For people like me who have read a lot of fantasy and see the same tropes and cliches turn up over and over again without much variation, it can be a little grating. To each there own, of course, and I would prefer to see more variation. But a lot of people, especially those in the middle grade and YA audience, do feel like outcasts and want to be reminded that they to can be something special. It can be inspiring for them and help them discover their own talents.