You seem to be making some large leaps to draw connections between things. Between Moebius's man-lion Kael and Darth Maul seems a very very weak link, given the loads of actual detail we know that went into Darth Maul's design.

That "Madmartigan" is a mixture of "Mad Max" and "Aragorn" again seems widely speculative.

Water as a gateway to a mystic otherworld is a classic motif of Celtic literature (with echoes in Classical Mythology as well). Tolkien certainly didn't invent it, and given the Celtic sounding Tir Asleen (Tir Na Nog being the place in Gaelic) I think it more likely Lucas was drawing from the same inspiration.

And I'm not sure you can, at the same time, say a mask is based on a Japanese Oni mask AND on a hockey mask.