Also... why in the world is Harry using the labels "He-Who-Must-Not-Be-Named" and "Dark Lord" in his thinking, rather than "Voldemort"? Ditto Quirrell. It seems pointlessly imprecise.

In canon, using Voldemort's name was highly discouraged. Also:

Chapter 3:

"Voldemort?" Harry whispered. It should have been funny, but it wasn't. The name burned with a cold feeling, ruthlessness, diamond clarity, a hammer of pure titanium descending upon an anvil of yielding flesh. A chill swept over Harry even as he pronounced the word, and he resolved then and there to use safer terms like You-Know-Who.