In the comments, bunopsia said their Ghost-type Charmander line was based on Greek mythology, namely from Charon, the ferryman of the River Styx, and the iconic three-headed hound named Cerberus.

and you're often at the mercy of having enough coin to buy a Centaur Heart or food from Charon, stumble upon a Centaur Heart room or healing fountain, or Boons like Selene's Moon Water. Ghost ...