No system + Western fantasy + defeated dog and many female protagonists + emotional development + a few memes
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The Adventer: A traveler from another world named Quan Ming. In order to prevent the world from being destroyed, the angels and demon kings cannot be allowed to succeed, and they can only be forced to turn the angels and demon kings into defeated dogs.
Demon Lords: Snatch the Adventer and use force to get him.
Angels: Advent, for the sake of world peace, you cannot choose those demon kings.
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In the end, Quan Ming's choice is... You should just be my loser. I am suspicious by nature and I dare not risk my life to trust you angels and demon kings.
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The descendant who masters the magic of the devil's substitute can unfold multiple mirror images of himself, whether male or female, human or orc. Multiple substitutes become Quan Ming's trump card.
Come on, author.