
Quick answer — Yana Toboso worked on Black Butler: Book of the Atlantic (Original Creator), Black Butler: Emerald Witch Arc (Original Creator), Black Butler: Book of Circus (Original Creator) and 6 more anime.
Yana Toboso worked on Black Butler: Book of the Atlantic (Original Creator), Black Butler: Emerald Witch Arc (Original Creator), Black Butler: Book of Circus (Original Creator), Black Butler: Book of Murder (Original Creator), Black Butler: Public School Arc (Original Creator), Black Butler (Original Creator), Disney Twisted-Wonderland: The Animation (Original Plan), Black Butler II (Original Creator) and 1 more.