Is the mc a Gazelle I'm only assuming the mc is a gazelle based on their cousin?
there may also be species intermingling assuming at least genetic compatibility.
so at the very least the mc must be of antelope family but not necessarily gazelle ... at least that what it would have been before the he got turned into a synth :)
of course this is only speculation at best since i'm not the one who wrote the story and their world may function differently in this aspect.
It's not immediately obvious, but the species of a couple's offspring is (for the most part) entirely random. A rabbit and dog couple could birth a cat, and another a hawk, for seemingly no reason. Even within families, it's rare to find two relatives who look alike (hence why the MC states their surprise upon meeting Nem's sister). The MC's original species is ambiguous. There is an explanation for this phenomenon, but I cannot say anything further without veering into spoilers so... =V