Based on the information given, it can be noted that the story about Nimona didn't have a happy ending.
A happy ending simply means an ending in a novel where a happy resolution is achieved.
In the story, Nimona was a shapeshifter and a villian. Her character, enthusiasm, and humor added to the depth of the plot.
The ending wasn't a happy one as Nimona didn't get a happy ending. In the end, she was left alone.
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