I was just going through Nero's intimate exchanges in Extra and I realized something very interesting–
Nasu is a hack.
No, really, he is and the absolute imbalance of whether to present Nero as a villain or as a dindu nuffins wavers throughout the whole game. It's infuruatingly inconsistent, and the little bio you get on the servant card or whatever basically brushes off the entire crux of Nero's despotic name, you know, the flagrant and horrific extermination of Christians.
That said, I think something great came out of his inability to figure out which direction to go with this character, and that is the very quiet not to both lurking insanity and longing for Christian love.
First, at numerous points throughout the story Nero makes it clear that, despite what the bio says and despite what the idiot protagonist likes to think on his own, she did indeed
- set fire to Rome
- persecute Christians
- make blood-sports celebrated among her people
and just in general act like a blood-letting fiend.
The story first gives us an incredible moment where Nero, as prideful as she is, at last admits that the reason she never gave up her identity to the protagonist earlier was because she was sincerely afraid of what he would think of her. She knew her reputation and the genuineness of her concern (to the point of tears) is really something.
How would Nero behave if he was resurrected as a Servant? Prideful, entitled, haughty, obsessed with the arts, etc. Sure, but what about his past? Would he hold regret all he had done?
—Sadly this gets deflated the instant Nasu decided to be a typical Jap and bang on about "muh pride" and how beautiful "muh pride" is and that regret means nothing with "muh pride", but the real soul of that moment was in how she found acceptance from the Master she was coming to adore.
Acceptance? Yes, and more…
Earlier than this we get to assume what kind of emperor Saber was before we find out her identity. If we say that she was likely a very benevolent ruler, she begins very excitedly, desperate to affirm our assumption as the truth…and then she falls silent. The narration tells us that it seems something, a memory, came to her mind then. And so she closes the conversion by saying her asking us to guess what kind of ruler she was had been a "tasteless" question.
This is the first instance of genuine humanity we find from her. The other dialogue options produce gag jokes to some extent. Yet here we begin to see real flesh and bone in Saber, and real remorse.
Even earlier than that we learn that Nero detests the Deus Ex Machina contrivance of old plays, wherein a deity from on high would descend to fix everything right, right all the wrongs, and give everyone a happy ending. And yet, though she detests it, the particular story she was spouting off about to the protagonist inspires her.
Why? Why is this story different for her? Because it exemplifies why people need a Deus Ex Machina– that is, an external force and deity to make everything right.
Saber even says as much, and then, before the discussion is through, she makes a certain allusion to her own desires (which we can figure come from her final moments).
Yet another sincere, quiet moment from her, and our first instance of a particular kind of longing…
Jumping ahead, Nero begins telling us of her life story by comparing it to a story, a grand drama, and so she closes off by doing the same. Notice, however, that this is very clearly not a fake story for her. She relates true events to a play to distance herself from them a bit, like anyone in pysche 101 can tell you. During the story Nasu flits again back and forth between "Nero just loved too much" and "muh pride" and "Nero nindu nuffins but she was totally evil and crazy but NUFFINS!!"
Nero automatically assumes that the protagonist knows the truth of the mystery of the fire in Rome which many claim was started by Nero, and which is said to have been in part the catalyst for Christian persecution by Rome (because it's said that Nero was being accused and shifted the blame onto them, which I'm sure the Jews of the Sanhedrin were all too happy to help that notion along). This is a HUGE HACK COP-OUT
Why? Because then Nasu would have to do the hard work and research genuine history and bring up the horrific persecution of innocents at Nero's command, and, you know, that's hard.
Or maybe it would just make it hard to sell plushies of her. Who knows?
Then, finally, Nero and the protagonist brush against a certain subject without fully mentioning it: Christian love aka agape love.