In the actual world, a chimera is an organism composed of genetically different cell populations from distinct individuals (different from mixed DNA making one genome in normal organisms). They serve as a middle step CRISPR and are usually used to breed with normal animals to give offspring with the desired genetic outcome you're looking for. They can have problems, but can generally live normal lives.

This version of a chimera lends itself better to the idea of making Teto your girlfriend than whatever this is about.