shinobi world:
-Pakura
-Kaguya Ootsutski
-Tsunade Senju
-Shizune
-Kushina Uzumaki
-Mikoto Uchiha
-Konan
-Miroku
-Shion
-Kurenai Yuhi
-Seramu
-Sara
-Mei Terumi
-Ringo Ameyuri
-Shizuka
-Guren
-Tayuya
-Kurotsuchi
-Samui
-Karui
-Mabui
-Maki
-Temari
-Izuna Uzumaki (Karin's mother) since we never know her name so I made it up
-Karin Uzumaki
-Yakushi Nono
-Hinata Hyuga
-Sakura Haruno
-Hanabi Hyuga
-Ino Yamanaka
-Tenten
-Naruko Uzumaki
-Satsuki Uchiha
-Yura (Pakura's daughter)
-Runa (Kaguya's daughter)
Pirates world:
-Nico Olivia
-Baby 5
-Monet
-Vinsmoke Reiju
-Bello Betty
-Violet Riku
-Rebecca Riku
-Nico Robin (Olivia's daughter)
-Nami
-Nojiko
-Kaya
-Tashigi
-Hina
-Ain
-Nefertari D Vivi
-Conis
-Raki
-Kalifa
-Perona
-Shiraoshi
-Madam Sharly
-Boa Hancock
-Shadi
-Domino
-Carrot
-Toki Amatsuki
-Hiyori Amatsuki (Toki's daughter)
-Black Maria
-Ulti
-Yamato
Fate Verse:
-Artoria Pendragon (Ruler)
and many more, this chapter will be updated periodically, of course the list will be increase along the way
if you want to recomend some waifu just put your comment here.
also, you have to remember this is a massive harem, what kind of massive harem without an abnormally massive number :)