so did I
But I guess you mean more Human characters to increase the ability to make human babys??
AFIAK that not possible short of modifying the code (I don't know how to make more MC's, but I imagine others might) and I doubt the Dev will add it, The MC is supposed to be you, and theoretically you are unique.
i think the reason isekai parlour doesn't get much love is because it's only similar in a barebones way. it might look similar, but this and MBM are breeding games, with MBM being a breeding brothel sim game and this being a breeding tower defense game. Isekai parlour has no breeding and it doesn't really go anywhere.
but to be fair, there really aren't any games like this or MBM that are worth a damn, so...