You could make your "Character Summary" a glossary at the front of the book. Then when you do an in book search on a word, the glossary entry is the first hit. Your reading software needs to have "back" functionality. As a 12 year kindle user who did not do in book searching in my pre-kindle days, I was shocked that many platforms do not have true "back" functionality.
And just FYI, the kindle X-ray functionality has what you are looking for and more (when they bother to do more than a half-ass job populating the X-ray database for the book).
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