See how often they participate in the script: HERE.
Character Story: The leader of Kakariko Village and a talented shaman. His village is left nearly abandoned because of the twilight invasion, but he stays and tries to keep things under control. He takes care of the children of Ordon when travelling home is too dangerous, and helps nurse the Zora Prince Ralis back to health when he is suffering.
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.