Secre Swallowtail, or mostly known by her bird form Nero, is one of the main characters in the anime/manga series Black Clover. 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. The latter would join Asta and the rest as a member of the Black Bulls.

She is voiced by Ayane Sakura in the Japanese dub (while Hitomi Sasaki voiced for Nero), and by Monica Rial in the English dub.


Secre is a very apathetic, calm, mature, and serious girl who showed great loyalty to Lemiel. When as Nero, she wound often get annoyed and pecked anyone in the head but mostly that was done with Asta whenever he acts idiotic or yells too much. 

However, she still remains loyal to Asta and sometimes can merely leave his side every once in awhile. Constantly helps and guides him in most situations.


Secre's magic affinity is Sealing

  • Inverse Release: Unlocks any type of seal.
  • Closed Sorrow: Fixes cut off limbs.


  • Secre's characteristics alludes to the Swallow in Oscar Wilde's Happy Prince.


           Black Clover title art anime.png Heroes

Clover Kingdom

Wizard Kings

Lemiel Silvamillion Clover | Julius Novachrono

Magic Knights


Marx Francois

Black Bull

Yami Sukehiro (Captain) | Nacht Faust (Vice-Captain) | Asta | Noelle Silva | Charmy Pappitson | Gauche Adlai | Zora Ideale | Finral Roulacase | Vanessa Enoteca | Grey | Gordon Agrippa | Magma Swing | Luck Voltia | Henry Legolant | Nero

Golden Dawn

William Vengeance (Captain) | Yuno (Vice-Captain) | Mimosa Vermillion | Klaus Lunettes

Silver Eagles

Nozel Silva (Captain)

Green Mantis

Jack the Ripper (Captain)

Coral Peacock

Dorothy Unsworth (Captain) | Kirsch Vermillion (Vice-Captain)

Blue Rose

Charlotte Roselei (Captain) | Sol Marron

Crimson Lion

Mereoleona Vermillion (Former Captain) | Fuegoleon Vermillion (Captain) | Randall Luftair (Vice-Captain) | Leopold Vermillion

Purple Orca

Kaiser Granvorka (Captain)

Azure Deer

Rill Boismortier (Captain)

Clover Kingdom Citizens

Lily Aquaria | Marie Adlai | Karna Freese | Orsi Orfai

Seabed Temple

Kahono | Kiato

Heart Kingdom

Lolopechka | Gadjah | Potrof


Sylph | Salamander | Undine


Elf Tribe (Licht | Patolli | Charla | Rhya | Vetto | Fana) | Liebe | Dominante Code | Fanzell Kruger | Mariella| Ralph Niaflem

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