Сакі

Another Steel Angel built by Dr. Ayanokouji, Saki was activated by Dr. Amagi with Dr. Brandow's help, and given orders to destroy Kurumi and seize her Mark II Heart. Amagi and the General decide to use the largest of the seized Angel Hearts to give Saki as much power as possible. Saki and Kurumi fight, with the latter being defeated easily due to Nakahito's still-standing order to not fight. The victory is short-lived however, as Saki's improper activation causes her to collapse. Kurumi kisses Saki, and her Mark II Heart reenergizes Saki's Angel Heart. The action permanently activates Saki, and the master-servant relationship is reinstated, with Saki pledging her loyalty and love to Kurumi.

Kurumi largely ignores this vow, but the two mutually call each other "sister" from then on. Later, Saki was kidnapped by Karinka, who brutally attacked and defeated her. It took Saki several weeks (and about 5 episodes) after Kurumi saved her to recover. Saki is very quiet, the antithesis of Kurumi, and is quite lady-like in comparison. She is the kindest, and maybe the sweetest character in the show. She entertains wild fantasies about herself and Kurumi, but never speaks about them or properly expresses her love. Saki wears a white maid's outfit with black trim, and sleeps in a yukata similar to Kurumi's.

She enjoys taking baths, though mainly because it allows her to be naked with Kurumi. (Source: Wikipedia)