Is this based in Greek mythos of Christian mythos(dante in particular)? i know that they both have a River Styx blocking passage into the underworld but i have never heard of Charon. I have read the Divine Comedy though and there, Phlegyas guards the River Styx.
In Greek mythology Charon is the ferryman of the dead. He only accepts those who are buried with proper rites and a coin has been paid for their passage. Those who cannot afford to pay the fee are doomed to wander the banks of the Sytx for 100 years