Sayaka Dejima

Age: 26
Position: Maid of the Shichijou household, Aria's personal maid in particular.

Dejima-san has dark eyes and long black hair she normally keeps tied up. She usually appears in her maid outfit (since she is Aria's personal maid) but on occasion will wear appropriate clothing. In such cases, she normally keeps her hair in a ponytail.

While Dejima-san normally displays a professional, almost deadpan personality, she sometimes gets overexcited. When that happens, she can act as immature as Naruko Yokoshima (who many characters point out is somewhat childish).That said, she normally speaks in an extremely polite, controlled tone of voice, and demonstrates the ability to perform well in just about any circumstance Aria requires.

She is also apparently quite sexually active, and is experienced at being a dominatrix.

(Source: Seitokai Yakuindomo Wiki)