Spoiler Alert: Nero is actually a human known as Secre Swallowtail, and she's just as cute as her anti-magic bird form! So, if you didn't already know those fun facts, now you do. From the outset of the series, we knew that Nero played a vital role. At first glance, Nero acts like Asta's familiar. She makes it a point to stay by his side and even builds a nest in his room.

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When other members of the Black Bull squad notice the anti-magic bird, they decide it needs a name. Unbeknownst to Nero, they've all viewed her as a member of their magic knight squad ever since that naming. Now that we've got her background out of the way, let's dig up some fun facts about this human turned anti-magic bird.

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10 Appearance

Let's begin with Nero's absolutely adorable appearance. Fun fact: Nero's appearance is different from your typical anti-magic bird. This cutie has upturned horns coupled with two tail feathers which are shaped like arrows. Two strands, made to look more like hair than feathers, peak up at the top of her head.

Noelle is obsessed with Nero and cannot get another of her eyes. If you haven't noticed, this anti-magic bird radiates attitude. Nero has a deadpanned expression the entire time unless she's hurriedly pecking at Asta. It's the expression that Noelle loves best.

9 Age

They say that knowledge is power, which couldn't be less true when it comes to Nero. Fun fact: Nero's been alive for a little over 5 centuries, so 500+ years. But, what has she been doing all this time? Searching for the one who'll break Lemiel's seal? Searching for the magic stones to undo that same seal?

At this point in time, we don't know, but one could hypothesize that she's traveled far and wide. It stands to reason that Nero had the time and drive to seek answers and solutions to the forbidden magic and stones.

8 Personality

Fun fact: Nero is lazy! Her deadpanned expression translates over to her human form. Her apathetic nature leads to her seemingly emotionless output; however, we see a change when it comes to her harassing Asta when she's annoyed with him.

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Nero's on the hunt for magic stones and helps Asta locate anti-magic weapons, but that's the extent of the help she's willing to lend. She's more often than not either perched upon Asta's head or settled on the sidelines to watch Asta stumble about as he faces off against powerful foes.

7 Familiarity

nero-asta-black-clover

As an anti-magic bird and Asta's constant companion, Nero is often found nesting in his hair or perching on his shoulder. When they aren't traveling, she sleeps in her nest in his room. They're not what you'd consider close, but they have an understanding of each other.

Fun fact: Nero hides in Asta's clothing. She's self-aware in anti-bird form, so just how close are these two?! Especially when Nero transforms into Secre, which makes us question the truth of their skinship. Secre doesn't question her relationship with Asta, but Noelle is more than aware of the familiarity between the two.

6 Magic Sense

Asta is the perfect perch for anti-magic birds because (wait for it) he has no magic! Or rather, he has no mana. Because the anti-magic birds are sensitive to mana, they stay away from those with high concentrations and tend to bug those with little to no magic. As they are so sensitive to magic, this brings up the question: How does Nero know where the magic stones and anti-magic sword are hiding?

Fun fact: there is no rhyme or reason to this. We can hypothesize that the magic stones possess a high amount of mana, which tips Nero off to its location, but that doesn't explain how she's able to help Asta with his second sword. So, let the theories begin!

5 Magic Stones

If we trace the story from the time Secre uses the magic stones to when she transforms into an anti-magic bird, we find discrepancies. What happens to the magic stones? We know devil, Zagred, uses the last of his time to cast a reincarnation spell upon the stones and that Secre uses them to seal Lemiel.

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Fun fact: Nero is the one that sealed the devil and Lemiel. How does Secre lose track of the stones? They could have gone with Zagred, and they weren't blown away, at least, not that we know of. So, during those 5 centuries, where were those magic stones?

4 Magic Tools

Lemiel's interests lie in magic tools and how they can be used by people. As his servant, Secre also studied and helped him with magic tool research and creations. For a baseline, the most common types of magic tools are brooms and wands.

Fun fact: Secre created the magic tool that allowed the Wizard King to store his time magic. By storing time magic, Julius Novachrono ensures that even if he dies, he'll survive. We see this when he's defeated and returns as a younger version of himself. He may resemble a cheeky brat, but he's still an older man.

3 Invisible Chain

Black clover sealing magic

Nero's character design includes puffed-up feathers around the neck. Fun fact: it's been theorized that this is symbolic of a collar. This theorization brings forth a slew of hypothesis and guesswork as to its meaning. One could say that it's symbolic of the cost of using forbidden magic.

This collar could also be reminiscent of her magic. She specializes in sealing magic, which makes her the hero of the day in many ways. By sealing away both the devil and Lemiel, it's as though she's sealing herself as punishment too.

2 Hero Status

Fun fact: the overuse of forbidden magic causes Secre to transform into an anti-magic bird. Back when Nero was known as Secre, and she was a servant to the first known Wizard King, she studied magic tools with Lemiel. Magic stones become the catalyst for Licht to transform into a giant demon, and later, Secre uses them to seal Lemiel because he was fatally injured.

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Even if Zagred casts reincarnation magic on the elves, toys with Patolli's emotions, and revives once again to create mayhem, Secre still deserves her hero status with the role she played in initially sealing away the devil.

1 Shadow Palace

Fun fact: Nero is only able to speak once the Shadow Palace appears. The Shadow Palace is a magical realm between the world of the living and the dead. This brings to light potential theories about the identity of Secre. In a sense, this makes it seem that Secre is both living and dead at the same time.

Why was her voice sealed away only to manifest when the Shadow Palace emerges? We may not know the reason, but we can hypothesize. It stands to reason that her voice was sealed in the same way she sealed the others - in a far off place where no normal magic could breach - as part of the cost for using forbidden magic.

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