Pluto first appears in episode 7.
isn't it called kuroshitsuji in the anime?
It already did.
Episode 75.
ciel,sebastian,udertaker,drocell,finny,bard,pluto
As of now there are no plans for Kuroshitsuji Season 3 to be made.
Kuroshitsuji Season 2, Episode 8; Divulging Butler.
Ciel in Wonderland is the Ciel in Wonderland OVA, it has no episode number; but it does have two parts.
They usually come out on the 16-19 of every month :)
Cannon, no. Fanfiction and fanart, possibly and yes.
Next month on the 18th. it will be a double post.
Episode 16 (the end of the Curry Arc) is where the first season of the show deviates from the manga. The following episodes of season one do not take place in the manga. You can find the story continuing from the manga in Kuroshitsuji: Book of Circus, the third season.
Next month on the 18, it will be a double post.