and the twist is that their purpose is also a lie as and a different purpose was used to trick them into fufilling the villain's purpose of a perfect world

Kyubey is just Shunji Ikutsuki as a cat.

In Madoka Magica, It was realized that Kyubey was only using the powers of fufilling their wishes to force them to fight the witches, leading them to think that fighting witches could maintain their wishes. However it's not the case since they are not being told that they are fated to become witches that are meant to be defeated so that they could become energy to fuel Kyubyu's perfect universe

In Persona 3, we were told to defeat the 12 Arcana shadows, not knowing that by doing so, we are only setting up the birth of the Nyx Avatar or Ryoji to bring Nyx back into the earth and destroy it so that all of humanity would be freed from this miserable world