Hey, have a small idea for group (guild) another game i played had this feature aswell and think it would be a good extra feature for group.
so here is the idea;
1. member can request a fragment 2-3 times (daily) of a ninja they already have (could be same ninja 1-3 times or 3 diffrent ninjas)
2. other members can then give that member fragments of that ninja
some times you do get fragments you dont realy need or want, but someone else in group might even trying to farm it daily, and this way it might go a bit faster if someone in group dont want the same fragment and deside to give them away to the requested member, also think the request should only be on ninjas you already own for reasons i think everyone understand ^^