According to the Kuroshitsuji website, there are 6 OVAs included in the DVD releases.
DVD 2: Ciel in Wonderland (Part 1)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.
DVD 3: Welcome to the Phantomhive's
This is meant to be like a simulation game. Elizabeth invites a lady (perhaps the viewer) to join her at a ball held at the Phantomhive mansion.
DVD 5: The Making of Kuroshitsuji II
This is a Hollywood style documentary with behind the scenes interviews with Sebastian, Ciel, Claude and Alois etc.
DVD 6: Ciel in Wonderland (Part 2)
This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story.
DVD 8: The Tale of William the Shinigami
William and Grell have to train new shinigami and reminisce about when they were training partners.
DVD 9: The Spider's Intention
The life in Trancy household and how those work under Alois is caring for him.+ More
More Seasons
Characters & Voice Actors

Michaelis, Sebastian
Main
Ono, Daisuke
Japanese
Phantomhive, Ciel
Main
Sakamoto, Maaya
Japanese
Abberline, Fred
Supporting
Suganuma, Hisayoshi
Japanese
Aberline, Edward
Supporting
Agni
Supporting
Yasumoto, Hiroki
Japanese
Anafeloz, Hannah
Supporting
Hirano, Aya
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