yoshida yuuko (machikado mazoku)

Titular character of the anime/manga series Machikado Mazoku. She is a newly awakened demon girl with brown eyes and brown hair (red in the anime) along with horns and a demon tail.

Her demonic alias is 'Shadow Mistress Yuuko' (シャドウミストレス優子), shortened by others to Shamiko (シャミ子).
Similar to magical girls, she can magically transform into a revealing Crisis Management Form costume to enhance her abilities.