See how often they participate in the script: HERE.
Character Story: The main hero of our story and the man fated by the goddesses to save Hyrule in its time of need. Holder of the triforce of courage, he is able to take the risks necessary to help his friends. This legendary fate is what keeps him from turning into a ghost in the presence of the darkness of twilight like other living creatures do. Instead, he is able to fight as a wolf. Link never speaks.
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.