It must be possible to build a horror property based on Winnie the Pooh that makes use of and engages with the source text in an interesting and thoughtful way rather than falling back on the cheap shock iconoclasm of "Oh, look, Pooh is killing people." Same for Thomas The Tank Engine, same for, I don't know. Teletubbies. Those first two were the only two where there's a really obvious angle of any kind that I'm frustrated about people ignoring, now I'm just naming shows for small children. Gesturing wildly
Are you familiar with GURPS Fantasy II from GURPS 3e?
There is absolutely no reason you should have been, to be clear. But given this repeated desire, you should go read that review, because they seem like you would be interested.
The Mad Lands have a specific pantheon of ten gods, and I'm not going to jerk you around: they are a grimderp interpretation of the cast of Winnie-the-Pooh. That is how good Robin Laws' drugs are.