It is about what each Machine values the most. Beauvoir (Simone) values beauty above all else, seeking Jean-Paul’s attention. Eve values his brother the most. Adam values hatred the most, and so on.
The Machine lifeforms were originally connected to the AI hivemind, and their original purpose was to "defeat all Androids." Due to the paradox of having no purpose if they defeat all Androids, the AI hivemind decided to deliberately handicap itself and disconnect some Machines from the network.
The Machines that were disconnected from the network no longer have a "purpose" and must now find their own reason to live. So they filled their "empty hole" (purpose) with whatever was lying around them, which happened to be remnants of humanity.
They started imitating whatever was around the area they were in. Desert bots imitated the sand tribe from NieR, castle bots imitated loyalty and medieval knights, amusement park bots imitated joy and fun... and so on.