User blog comment:Forrestib/Crossover/@comment-25405817-20141220023541/@comment-25555436-20141221001412

@73: What about the Soul CaliburxStar Wars Crossover? What does these 2 franchises have in common?

Or the SonicxMegaman crossover comic? What do they have in common? Other than both being blue and fighting "Evil" old genius ugly men (Eggman and Willy).

Or, what does Fire Emblem and Shin Megami Tensei have in common? Other than high dificulty most of the time.

Just to see how much in common do 2 things have to be for a crossover? Because I'm sure you're not refering to the SMB type of crossover.