See how often they participate in the script: HERE.
Character Story: Colin's father and Uli's husband. He wants to do his best to protect his family and Ordon Village from the twilight invasion. He eventually joins the resistance group at Telma's Tavern and teaches Link about the temple and the Lost Woods.
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.