* ActingForTwo: Lavi and the Millennium Earl were both originally voiced by Creator/JasonLiebrecht. When he was injured due to a motorcycle accident, Creator/ToddHaberkorn temporarily filled in for Earl during his appearances in episodes 27-39 while also playing Allen and Creator/ChrisPatton filled in for Lavi.
** Then there is the fact that in ''Hallow'' Yutaka Aoyama is voicing two characters. It might be related to the latest manga reveal though.
* CrossDressingVoices: Allen's Japanese voice actor in the first series is Creator/SanaeKobayashi. In English, it's only played straight with Young Allen, who, in the flashbacks, is voiced by Creator/LuciChristian, who also plays Lenalee. It is averted in the present, where Allen is played by Creator/ToddHaberkorn.
** {{Averted}} now in the Japanese version of ''Hallow'', since Allen is now voiced by Creator/AyumuMurase.
* DisownedAdaptation: In a 2016 interview for ''Hallow'', Katsura Hoshino felt that the first anime was so different from her manga, due to TMS Entertainment changing several elements of her original stories. TMS approached Hoshino to produce ''Hallow'' and release it with the manga after its hiatus, but given her feelings on the first anime, she unsurprisingly refused. TMS would eventually convince Hoshino to reconsider, thus, she served as a supervisor for ''Hallow'' to make sure it stayed much closer to the spirit of her manga than the previous adaptation did.
* DoingItForTheArt: At this point, after years of hiatuses and with a chapter every 3 months, Hoshino is no longer concerned by cancellation (the Jump SQ Crown mostly publishes one-shots anyway) and can pretty much do whatever she wants with her series. It's very unlikely that the latest volumes would have veered off so much from a traditional shonen formula if the series had stayed weekly.
* IKnewIt: The Earl [[spoiler:has horns]]. Doubly so for those who read ''Zone'', the oneshot that provided the inspiration for the entire series. Also that he [[spoiler:is not his true form.]]
** On a meta example, there were fans that guessed that ''Hallow'' would be part of Creator/Funimation's summer simulcast season, despite not releasing the second half of the 2006 series on home video for five years until the legal issues between Funimation and Dentsu were sorted out. Turns out they were right.
*** There were also people thinking that licensing ''Hallow'' for simulcast would lead to Funimation licensing the second half of the 2006 series. On June 30, 2016, the company announced just that; the second half of the 2006 series would eventually be released to home video starting October 10, 2017.
* KeepCirculatingTheTapes:
** Only half of the first anime series was broadcasted in Spain, and none of it was ever released in DVD or tape. According to interviews, the entire series was dubbed, but the second half of it never left the company archives and it is unknown if it will ever do.
** On March 1, 2017, the Japanese home media release of ''Hallow'' was cancelled due to various circumstances. Fortunately, the episodes are available for streaming online and Funimation released them on Blu-ray and DVD in North America.
* NoExportForYou: This was originally the case with the second half of the 2006 series, due to [[ScrewedByTheLawyers legal issues with Dentsu]]. It would take ''five years'' for said legal issues to be sorted out before Funimation was finally able to license episodes 52-103.
* OldShame: Katsura Hoshino lamented that TMS Entertainment would never be able to adapt the series into an anime again, at least not until she would eventually become the supervisor for ''Hallow'' at their insistence.
* TheOtherDarrin:
** In the 2016 series, most of the Japanese cast have new voices.
** In the English dub, when Creator/JasonLiebrecht was injured in a motorcycle accident, both of his roles, Lavi and Millennium Earl, were temporarily recast with Creator/ChrisPatton and Creator/ToddHaberkorn (Allen's voice) respectively during their appearances in episodes 27-39.
** Hallow's dub has Creator/IanSinclair taking over for Creator/TravisWillingham as Kanda due to the latter being mostly in union-only projects after moving to Los Angeles. Froi will also need replacing should he appear, as his original actor Jerry Russell died a few years before Funimation picked up the rest of the series.
* RelationshipVoiceActor: The English dub has several.
** [[Creator/ToddHaberkorn Allen]] and [[Creator/CheramiLeigh Road]] are also [[Manga/SoulEater Death the Kid and Patty Thompson]], [[Manga/DaimidalerTheSoundRobot Shouma and Kiriko]], [[Manga/FairyTail Natsu and Lucy]], and, in a darker example, [[LightNovel/SwordArtOnline Sugou[=/=]Oberon and Asuna]].
** [[Creator/ToddHaberkorn Allen]] and [[Creator/LuciChristian Lenalee]] are the teen and kid versions of [[Manga/FairyTail Natsu]], respectively.
** [[Creator/ToddHaberkorn Allen]] and [[Creator/TravisWillingham Yu Kanda]] (in the first 51 episodes) are [[VideoGame/FireEmblemAwakening Male Morgan and Lon'qu and Brady]].
** In the Japanese version, [[Creator/KenichiSuzumura Lavi]] and [[Creator/TakahiroSakurai Yu Kanda]] are voiced by best friends Suzumura Kenichi and Takahiro Sakurai, who also were the voices for [[VideoGame/FinalFantasyVII Zack and Cloud]], [[Manga/ZombieLoan Chika and Shito]], [[Manga/SeraphOfTheEnd Crowley and Ferid]] and many more.
* ScrewedByTheLawyers: Eventually {{subverted|Trope}}. Funimation began arranging plans to release the second half of the 2006 series in North America after releasing the first 51 episodes. However, the release was locked away in 2011 thanks to Dentsu asking Funimation for more money than the company was willing to afford. In June 2016, [=Funimation=] announced that it had licensed ''Hallow'' as part of the 2016 Summer Simulcast season, as well as the second half of the 2006 series a week later.
* ScrewedByTheNetwork: Creator/{{Aniplex}} was originally going to release ''Hallow'' on Blu-ray and DVD starting in September 2016. Unfortunately, issues with the production quality caused the release to be delayed indefinitely at the beginning of that month. By March 2017, Aniplex cancelled the release. Fortunately, Funimation released the series on Blu-ray and DVD in North America.
* {{Uncanceled}}: The first anime series got a sequel almost a decade after the original ended.
** After fifty-one episodes of the original anime series were released between 2009-2010, the North American English release came to a halt because of legal issues with Dentsu. Funimation would eventually continue their release of the series in 2016, after those issues were resolved.
* WhatCouldHaveBeen:
** Creator/ToddHaberkorn, also the director of the first half of the 2006 series, 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 initially planned to dub the show to the end, like a long-runner).
** Lavi was originally intended to be main character for a series called "BOOK-MAN", a project which never reached beyond the planning stages. Still, the author wanted to use him and Bookman so they made it into ''D.Gray-man'' as side characters instead.
* TheWikiRule: Has a wiki [[http://dgrayman.wikia.com/wiki/D.Gray-man_Encyclopedia here]].
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