Edelgard

エデルガルト, Fallen of the Dragon, Eyes Edelgard

She is a short and beautiful demonic girl with brown skin (with the skin surface seeming like scales), long silver hair that reaches to her waist, and big golden eyes that have vertically torn pupils like that of a reptile with childish ambiance being felt from them.

(Source: How Not to Summon a Demon Lord Wiki)