Draco Malfloy appears less in each book because JK Rowling said "since evil is rising I feel less need for a bad boy". Also he appears more in the last three books because he is becoming evil.
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Thank you @splashywave11 for telling me this fact!
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Facts about Harry Potter that you didn't know
RandomIn this book you'll finds some facts about Harry Potter characters that you probably didn't know. Enjoy! Disclaimer: I own nothing