Not the savior children who return over and over again from another world; I couldn't build that up in a single novel and have it still make since.
Actually, I think you could. Look at The Magicians, which (although I haven't read it) is in conversation with HP & Narnia--and is considered to be original fiction. Even aside from the Grossman, the concept of the portal fantasy, in which a youth from this world goes into another, fantastic, world and saves it (in the process usually coming into their maturity), is very much a standard one in modern western fantasy. Patricia Dean, Barbara Hambly, Joy Grant, Joyce Ballou Gregorian, and dozens of others have done it, in addition to Lewis.
The specifics of the Pevensies might need to be tweaked: four children, from WWII-era England, is a bit too close. And the specifics of Narnia: Lewis' bizarre mishmash of sources, classical and Catholic, would probably need to be adjusted.
But I think the rest of it, the OCs, the world-building, the themes, and the story that you have going here, is sufficiently original, and interesting, to stand on its own.
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Actually, I think you could. Look at The Magicians, which (although I haven't read it) is in conversation with HP & Narnia--and is considered to be original fiction. Even aside from the Grossman, the concept of the portal fantasy, in which a youth from this world goes into another, fantastic, world and saves it (in the process usually coming into their maturity), is very much a standard one in modern western fantasy. Patricia Dean, Barbara Hambly, Joy Grant, Joyce Ballou Gregorian, and dozens of others have done it, in addition to Lewis.
The specifics of the Pevensies might need to be tweaked: four children, from WWII-era England, is a bit too close. And the specifics of Narnia: Lewis' bizarre mishmash of sources, classical and Catholic, would probably need to be adjusted.
But I think the rest of it, the OCs, the world-building, the themes, and the story that you have going here, is sufficiently original, and interesting, to stand on its own.