Back to my answers about Death Eaters, I have
scifi.stackexchange.com/a/112941/4918 "Why did Lucius give Tom Riddle's diary to Ginny?", but I didn't have to think like Lucius for that, I just copied some quotes from the book without much explanation and got a high score because the question asks something that the book already answers well, just like in my currently all around highest voted answer.