I told you guys already, I don't know his parents. :^)
In all seriousness, who would you even consider your waifu's creator? There's a lot of people who work on her, most likely. For a visual novel, there's the scenario writer, the director, the artist, and the voice actor. I'm not sure if I'd say one is more important than the other.
As for Togainu no Chi, the scenario writer (Fuchii Kabura) has only written for the other N+C games, most of which I've read aside from Lamento. They're all pretty successful, and for good reason. I respect his talent and don't really have any reason to dislike him. I will definitely read any other visual novels he and N+C put out. Urobutcher directed and Kurahana was the original artist. Sugita is Keisuke's voice.
I don't know what to make of Urobuchi, honestly. I keep trying to put what I'm thinking in to words but it's not working right now so I'll leave it at that. I really love Kurahana's art although I don't go out of my way to watch or read other stuff she's involved in unless it catches my interest otherwise. The same goes for Sugita as well, although I have a weak spot for roles that he plays now and the characters he voices tend to be my favorite or second-favorite.
I don't know what the others think of Keisuke, but I do know that Sugita said he was excited to return to Keisuke's role when the anime came out because he really liked playing him. Such a shame that the anime was absolute garbage! I also know that Kurahana apparently has a bit of a sore spot regarding her time working as a character designer for N+C because she doesn't list it on her resume or portfolio anywhere. I slightly doubt that it has anything to do with the actual work she did (let alone Keisuke), though.
I wish I knew who exactly wrote the scenario for the manga that Chayamachi Suguro drew the art for because whoever they are, I have a lot of respect for them and I think they did a really good job with the adaptation. Chayamachi seems pretty cool too.