Final answer:
The 'friendly' shapeshifter from the given options is the Selkie, a creature from Scottish mythology that can transform from seal to human by shedding its skin.
Step-by-step explanation:
The example of a 'friendly' shapeshifter among the provided options is the Selkie. Selkies come from Scottish mythology and they can transform from seals into humans by shedding their skin. Unlike werewolves, skin-walkers, and kitsunes which can be dangerous depending on the mythos, selkies are generally seen as peaceful and friendly creatures in the myths.
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