Outsider characters can act as connectors to some other reality or world. I really, really need to read a bunch of the stuff I've seen referenced this Bittercon session, but given my scant reading, what popped into my head was the tramp character in The Dark is Rising.
Liminal characters can be messengers, and they move back and forth between worlds more or less with impunity, although they may have sacrificed their sanity (or some other thing) in the bargain.
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Liminal characters can be messengers, and they move back and forth between worlds more or less with impunity, although they may have sacrificed their sanity (or some other thing) in the bargain.