Harry Potter and the Deathly Hallows
How we cite our quotes:
"Expelliarmus is a useful spell, Harry, but the Death Eaters seem to think it is your signature move, and I urge you not to let it become so!"
Lupin was making Harry feel idiotic, and yet there was still a grain of defiance inside him.
"I won't blast people out of my way just because they're there," said Harry. "That's Voldemort's job." (5.55)
Expelliarmus (the Disarming Spell) is Harry's signature move – and for a reason. As he comments, he's not willing to use violence against people who don't merit it, which displays the strength of character and sense of morality that Harry's developed over the past few years.
"Where no proven Wizarding ancestry exists, therefore, the so-called Muggle-born is likely to have obtained magical power by theft or force.
"The Ministry is determined to root out such usurpers of magical power…" (11.38)
Voldemort's desire to get rid of all non-pureblood Wizards is really a problem of identity – he's taken it upon himself to decide who is really a wizard and who isn't. However, there's the problem of personal identity – Muggle-born wizards really are just as magical as purebloods, and Voldemort's new restrictions are simply lies.
"If there was one place that was really important to You-Know-Who, it was Hogwarts!"
"Oh, come on," scoffed Ron. "His school?"
"Yeah, his school! It was his first real home, the place that meant he was special; it meant everything to him, and even after he left –."
"This is You-Know-Who we're talking about, right? Not you?" inquired Ron. (15.23)
The similarities between Harry and Voldemort seem to be too much at times – they make Harry capable of understanding the evil wizard better than anyone else can, but they also make for an uncanny crossover between the two.