Sakuya Aikawa

Sakuya is a strange and cold girl who is openly disgusted by organic life, owing to be raised in the Children of the Ancient Machine. Indoctrinated from birth to reject both emotion and her own humanity, Sakuya instead dedicated herself to mechanical tinkering. She honed these skills over years, building herself a prosthetic arm from scraps and running campaigns of techno-terrorism to further her cult's goals. She's also a fervent otaku, in spite of her aloof exterior.

[From official site]