Personally I dont give shit about daughter, regina is so much more interesting character and I would love her to be more fleshed out, her struggles her love for mc her desire to stand beside mc and her failing to do so and coming to terms with it,
when you look at it she came as a cliche tsundere and became the most interesting character in the manga far more then the three daughter who are geniuses who also want to fuck their dad, but who am I kidding we are getting incest and daddy issues, lets goo boys