James,
We've been studying your app, but there are some problems. We have a list of canon families, here,
https://www.pottersarmy.net/t10313-canon-list. And the Gaunt family was not included on that list because, as near as we could determine, there didn't seem to be a continuation of that family line and most likely would not have decendants at this point in the future.
Second, we have a policy on PA that we don't admit characters with mental illness/developmental disabilities because sometimes they have not always been treated with dignity and sensitivity when we allowed it. It doesnt appear, that even if we could find a way to allow the Gaunt family, that we could separate the mental illness from it that Rowlings suggests in canon. And that would be an additional reason why we would not allow the Gaunts on PA.
However--I do love the way you write. I love the Sherlockian framework to James. (I'm a Sherlock Holmes nut! So the multiple homages to Holmes is lovely for me to see.) I really, really would like to see him in some manner on the boards. Perhaps an original character that is not a canon family. Please don't give up. Just re-frame him. And do, by all means, keep the Downey pb! Its great!
Let me know if I can help in some way.
k.