What sort of build would be appropriate for a Shaman dedicated to a River Spirit? Or maybe an otter.
For 4th ed D&D I'd go with a Guardian Shaman Human with the Foamgather Heritage feat. I went with guardian because it is the most defensive and healy which I think fits a water theme well. The Dark Sun campaign book has an elemental spirit build option for the shaman which might work well too. The foamgather feat is there for a water tribe feel without going water genasi.