The main part of the story will not have cameos from outside Taikosong chars. However, post-story will be pretty much open to almost all ideas; in fact, I'm planning one post-story plot where Redzone, using his position as both Head of Shimizu and minister of a distant land (where said distant land has him acting on the other side of his bloodline), stumbles upon a mission request that's said to be "written by the creator himself", thus calling all of the best adventurers from their bloodline. This includes Ryougen and Blackrose from this mainland, and 2 more from other worlds each. Basically, I'll be getting at least 2 Tatsh song chars by game; however, I am actually unfamiliar of many of his songs (and where they even appeared); Revolver may represent MGG. I'll do quite some research (...or you know, help me out here) by the time I'm going to write that part, which is kinda still far away from now...