I think you shouldn't sweat over the plot so much? I think most people who would like to join an Inuyasha roleplay site are

• a: feeling nostalgic
• b: would like to play a youkai/likes the setting; feudal Japan
• c: would like to hunt for shikon fragments
• d: likes the time travelling aspect of the series.

So I think you are pretty much set? Btw is there a reason why you'd like to cap time-travelers? I just feel this is one of the main reason why most of the Inuyasha roleplays died? I do understand you don't want hundreds of Kagome clones running around, however I think most of the Inuyasha fans are already all grown up and they know better than to create carbon copies of the main character. However, I might have too much faith in humanity So I don't know but it might be a better idea to restrict the number of time-travelers in a different way? For example: one per member and then later on members could gain another time-traveler spot if they participate in some epic fight for one of the shards or whatever. I'm just throwing around ideas here as at the end of the day, it's your board <3

Have you considered checking out the rulebook? It might help you with the fighting system as originally it was a Japanese TRP. :3 However, it might be a bit too stats heavy... So yeah. lol Please forget I said anything XD Good luck though, I love the setting.