Hello, I'm sorry for any confusion. [ And I'm sorry for the very slow reply, itchio randomly stopped sending me emails about comments ]
I don't have any of my social media accounts any more so I can't look up any permission messages nor can I remember them. I'm sorry.
My general policy is to allow the use of my characters in games as references or cameos, but not to allow them to be written at length/be a main character in other people's games.
I've deleted the section about "Gomenne Gomenne" on my personal website, as I really don't want to cause any trouble, but my policy is still the same.