* HeyItsThatVoice: Allen is voiced by Creator/SanaeKobayashi. In other words, [[ElfenLied Lucy]]. You may now run away and hide under the bed.
** [[Creator/TakahiroSakurai Kanda]] and [[Creator/KenichiSuzumura Lavi]] were previously friends in [[VideoGame/CrisisCoreFinalFantasyVII Crisis Core]] with their personalities being similar. Kanda and [[Creator/ToshiyukiMorikawa Tyki Mikk]] have clashed before under the names of [[VideoGame/FinalFantasyVII Cloud and Sephiroth]].
** In Funimation's dub, Allen is [[LightNovel/{{Baccano}} Firo]], [[Manga/AxisPowersHetalia Italy]], [[Manga/{{One Piece}} Kohza]], [[{{Soul Eater}} Death the Kid]], [[Manga/FullmetalAlchemist Ling]], [[{{Sgt Frog}} Keroro]], [[{{Ouran High School Host Club}} Hikaru]], and [[{{xxxHOLiC}} Watanuki]], just to name a few.
* WhatCouldHaveBeen: Creator/ToddHaberkorn, also the director, knew about the Black Order members being British, and contemplated putting those accents on them. He decided against it because the test recordings made Allen sound harsher and less appealing, and their natural accents would be easier on the actors (this was when they had planned to dub the show to the end, like a long-runner).
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