What are the features of the shaman? (s)he has gone to the underworld (or overworld) and been reborn, but lives in this world. Interacts with the spirits on behalf of humanity. The spirits have given him/her magic powers. Usually has the power to call people back from the brink of death. Sometimes has the power of shapeshifting.
What shamans can you think of? Neo in the Matrix is an obvious example, and so is Dr Who. I was wondering whether they exist in more mundane contexts.