Kuroshitsuji is its own show and Drocell is a character in the show.
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In the Black Butler anime, Drocell first appears in episode 10
You can watch the show off YouTube. Dubbed and subbed.
Kuroshitsuji was created by Yana Toboso.
A Japanese anime known as Kuroshitsuji or, Black Butler in English. Alois Trancy is featured in the second season of the anime, Kuroshitsuji II. He is, you could say, the villain or the antagonist.
His name is Drossel (Drocell) Keinz.
Kuroshitsuji was originally a manga.
In the first Kuroshitsuji Musical there are 7 songs. In the second Kuroshitsuji Musical there are 15 songs.
There is no main character from Kuroshitsuji named Claudia. There is only Claude Faustus, who is one of the main characters in Kuroshitsuji II.
Unanswerred questions about kuroshitsuji can be found at the link at the bottom.
If they are a fan of Kuroshitsuji, I would recommend Hellsing.
As of now there are no plans for Kuroshitsuji Season 3 to be made.