Letoile is a bespectacled young woman of below average height with purple eyes and long, green hair tied in a ponytail. She is usually seen wearing the Golden Dawn's squad robes.
Letoile is a serious individual, who puts her comrades' well being before anything.
A few days later, Letoile and another Golden Dawn encounter Langris Vaude and Finral Roulacase in a hallway of the Golden Dawn base. Finral asks the two women out on a date, and Langris chastises him for the behavior and storms off.
Six months later, three Spade Kingdom mages attack the Golden Dawn base. The Dark Disciple Foyal Migusteau traps Letoile and several other Golden Dawns in the courtyard with his Mist Magic. Taking shelter in Another Atlas, Letoile tries to locate the real Foyal but the mists hinder her spells. When Yuno arrives and uses his Wind Magic to reveal Foyal's real body, Letoile seizes the opportunity and raises Another Atlas around Foyal, stripping away his mists. Klaus Lunettes follows up and hits Foyal with Blazing Spiral Lance, knocking him unconscious. As the three Golden Dawns talk, part of the ceiling crumbles and reveals that Zenon Zogratis has defeated William. When Zenon attacks them, Letoile and Klaus combine defensive spells, but the Eternal Fangs break through and impale the pair.
- Large Magic Power: As a noblewoman, Letoile possesses a large amount of magic power. After being freed from Kivn's possession, Letoile retains some of the elf's magic.
- Grimoire: Letoile possesses a three-leaf clover grimoire that contains various compass-based magic spells. The covers have large compass roses.
- Her name may be based on l'étoile, French for "star", while her surname may come from Henri Becquerel, a French physicist who was the first to discover evidence of radioactivity.
- Black Clover Manga and Anime — Chapter 179 (p. 3) and Episode 98.
- Black Clover Manga and Anime — Chapter 172 (p. 14) and Episode 98.
- Black Clover Manga and Anime — Chapter 172 (p. 10-15) and Episode 98.
- Black Clover Manga and Anime — Chapter 213 (p. 7-11) and Episode 120.
- Black Clover Manga and Anime — Chapter 224 (p. 7-9) and Episode 128.
- Black Clover Manga and Anime — Chapter 237 (p. 5-15) and Episode 161.
- Black Clover Manga and Anime — Chapter 238 (p. 4-8) and Episode 161.
- Black Clover Manga and Anime — Chapter 239 (p. 3-9) and Episode 161.
- Black Clover Manga and Anime — Chapter 173 (p. 7) and Episode 107.
- Black Clover Manga and Anime — Chapter 237 (p. 5) and Episode 161.
- Black Clover Manga and Anime — Chapter 177 (p. 5) and Episode 108.
|Langris Vaude • Yuno|
|Hamon Caseus • Klaus Lunettes • Mimosa Vermillion • Siren Tium|
|David Swallow • Letoile Becquerel|
|Hamon Caseus • Siren Tium|
|Kivn • Letoile Becquerel|