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Honestly, no they dont. Yes they are a cute lilgimmick, but if you have played more than 1 Suikoden you already know Tree beads turn water green, Devil turns water red , etc and the toy boat, toy duck, etc are just that.
Unless you absolutley love them they are cute to see once per game but after that no ther is no real puprose to them they do not change the scripted bath scenes etc.