Scion of Murgen (He/Him)
Yup. There was also Under the Broken Moon using mechanics from Over the Edge, and I believe someone did a fan GURPS conversion for it too. Mutant Future is also a decent fit, and Thundarr is certainly one of the inspirations for it.
Not official, but isn't this more or less what Ryuutama is?I'd like to see an official Miyazaki RPG set in an original world of his design. I mean, I'd play a RPG set in any of his worlds, but having one designed specifically for a RPG would be amazing.