Who's Nero in Black Clover?

Secre Swallowtail, or mostly known by her bird form Nero, is one of the main characters in the Black Clover franchise. Secre was once the loyal servant of Lemiel Silvamillion Clover (whom was the first Magic Emperor) and his noblewoman before he was sealed away by her, which also turned her into an Anti-bird.

Is Nero Asta's spirit?

Is Nero A Spirit? Many fans have speculated that Nero could be an anti-magic spirit for the longest time since she always follows Asta around and can find the magic stones. However, Nero is not a spirit. Nero was revealed as a human named Secre Swallowtail in Chapter 203.

Who is Asta's bird?

As an anti-magic bird and Asta's constant companion, Nero is often found nesting in his hair or perching on his shoulder.