Nuns, Maids, and Demon Slayers

For those who like their nuns with guns, their maids packing a punch, and their demon slayers working with the enemy:

Chrono Crusade by Daiskue Moriyama

Black Bird by Kanoko Sakurakoji

Kekkaishi by Yellow Tanabe

Mugen Spiral by Mizuho Kusanagi

Maid Sama by Hiro Fujumura

Hayate: Combat Butler by Kenjiro Hata

Emma by Kaoru Mori

Yu Yu Hakusho by Yoshihiro Togashi