True he has that Ranma Crossover with Change 1-2-3 that is good and the manga is finished, there is one crossover with ultimate marvel before they fucked it up by killing Peter Parker that I'd like to see continued as well as the Tenjho Tenge cross and that Ranma's adventure megacrossover.
He has a FFT/ZnT crossover that is so so, Ramza's character is a little stilted, and it forces the zodiac demons into the ZnT story where they really aren't needed and it already over complicates the story.