Siduri dedicates herself to supporting King Gilgamesh’s rule of Uruk. An elegant and intelligent lady, she cares greatly for Uruk and its people, making her the perfect person to advise the king. She is beloved by Uruk’s citizenry, and is known to always have their best interests at heart. While she has tremendous respect and trust for her king, she is not afraid to speak against him when she must.

(Source: anime.fate-go.us)