As for Quaser anime??? None really. But the ability to get powers from female milk??? I would want to get that ability no matter what, female milk whenever i want? And i get more powerful? Sign me up. Make Yasaka lactate pls
From DxD.... i would choose around 10 girls or so. Of which Yasaka and Konou are a must. From New Sis Devil pls add Maria, Mio and zest, from ikki Tousen... well the list is huge, lests see who you add, and from Beelzebub... the maid of Hildegarde of course.
For the hârêm, which girls you are sure to add? From DxD there are a lot, but From the other animes only few matter. Such as Uzaki-chan... but she is normal. I dont get why you added her anime.
