spoilers
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• The other child is a homunculus. She is created by a mage and a witch from the hero's blood so technically she is a fake human. The witch is like Ruri who is also trying to follow the flow of the story. The fake child is known as the main character and her goal is for the child to have a happy ending. This means her goal is to also make bunny the villain for the story to be succesful so that the witch can go back home (i'm guessing that she was also reincarnated).

Then who's the other girl that's supposed to gain the hero's affection (I bet she looked like a spitting image of the deceased older brother, that's the only explanation why he'd be fond of her based on what Ruri told Bunny)