I'm gonna have to do a rewatch of Medaka Box before I get started on Abnormal. I'm glad that I haven't started Casshern Sins or Casshan: Robot Hunter Casshern yet. Could you recommend what order I should watch the three Casshan titles in?
It pretty much doesn't matter with Casshern Sins because other than having characters with the same names, the plot is very different from the main series. There wouldn't be any spoilers, because it occurs in an Alternate Universe. The movie is a shortened form of the series, so it would hit on most of the key points. So in the long run the order you watch them in would depend on whether you want any spoilers plot wise.