There are too many good Waifus in Genshin Impact to not make a Harem, now I won't make every girl part of the Harem, but the list will be long.
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Lumine:

Lisa:

Jean Gunnhildr:

Ganyu:

Beidou:

Yelan:

Hu Tao:

Yae Miko:

Kokomi:

Ayaka:

Rosaria:

Raiden Shogun:

Kujou Sara:

Eula:

Mona:

Amber:

Xinyan:

Fem Zhongli:

Fem Kaeya:

Fem Diluc:
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Now this isn't all, there are a few more girls who I'd like to add.

Now, along with the rest of the girls I'm adding, there are 3 free spots, so tell me the 3 you'd all like me to add.