See how often they participate in the script: HERE.
Character Story: Coro lives in a small house in Faron Woods, slightly North of Link's Ordon Village. He spends most of his days in nature and sells lantern oil to travelers who will need to make it through the dark, winding tunnels in the forest.
Race Story: Humans typically live peacefully with other races throughout all of Hyrule. The more specific Hylian race is a subcategory of humans. They can be differentiated by their ears -- Humans have rounded ears and Hylians have pointed ears.