Merged game companies rarely fuse their franchises together, but when the two partnered entities' action-genre focus overlaps as much as Koei and Tecmo's do, inter-brand cameos come naturally. That's why we weren't shocked to hear that Ninja Gaiden's Ryu Hayabusa and Warriors Orochi's Nu Wa would make appearances in the PS3 and Xbox 360 versions, respectively, of Dynasty Warriors Multi Raid. In addition, Multi Raiid's Sun Shang Xiang and Zhao Yun will appear as costumes in Ninja Gaiden Sigma 2. At this rate, we expect the many, many ninjas from Koei and Tecmo's respective properties will soon be thrown into a "ninja pool," which players of any their titles will be able to choose from. For the record, we're strong advocates for this ninja unionization. Fairer wages for our shiruken-slinging brethren!

Read more at Joystiq