I'd like to see a daughteru CYOA, one where you can choose:
1. how you got her: is she related? a stepchild? adopted? an alien? a robot? an undead/frankenstein? a homunculus/familiar? etc.
2. her appearance/physique: how tall/short is she? what kind of figure will she have? how long will her hair grow? what color will her skin be? what about her eyes? how cute/sexy will she be? etc.
3. romance: will she be interested in boys or girls? how interested will she be?
4. psychology: what is her personality like? (uses the big five), how intelligent is she? (uses various IQ ranges), what about her personal ethic? (uses r v. k psychological theory)
(or maybe give the option to do something like choosing from anime archetypes)
5. what skills and interests be? what natural abilities will she have? what unnatural abilities will she have? with a selection of skills, interests, natural abilities, and unnatural abilities (scifi or supernatural).
5. disadvantages: you can also take negative traits for more points to spend on the positive ones, some disadvantages are incompatible with certain positive traits, and some mighty actually be desirable (for example, one disadvantage where she never leaves the nest, and plans on living with you until you die, or the next level where she always wants to be by your side).
What setting will you be raising her in? Fantasy, Sci-fi, Horror, Slice-of-life, etc.
Just some ideas…