Yor Briar

Yoruichi

Cogita

Yorck

Belfast

Freya (AKA snow queen)

Raynare

Esdeath

Rin suzune

Kuybyshev

Ayaka sunohara (I'm not going to lie, she's cutely wholesome.)

Chapayev

Prinz Eugen

Venelana Gremory

Takizawa kyouko

Illustrious

Storm (Ororo Munroe)

Rangiku

Bismarck Zwei

Rias Gremory (She does count. If I remember that all the girls from highschool DXD is 18 or older, right?)

(Next one, his harem part 2 hope you guys enjoyed it.)