While Problem Children are Coming from Another World, Aren't They? (aka Mondaiji-tachi ga Isekai Kara Kuru Sō Desu yo? or Mondaiji) has already inspired some towels and other minor merch, the more elaborate character goods items are finally starting to turn up.
ALPHAMAX, known for their swim suit figure, has just scheduled a Black Rabbit figure for August. The 1/7th scale, 24 cm figure will be available in blue and pink haired version for 6,500yen each ($70).