See how often they participate in the script: HERE.
Character Story: Ashei hails from the mountains of Hyrule, where she received strict training from her father. She has a strong sense of justice and as a result finds herself as a member of a small group of locals resisting the Twilight Invasion fueled by an impatience for the ineffective soldiers.
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.