Really nice exploration going on and it's cool that you've got your mind clear on how you want to stylise.
My favourite so far is probably 2 BUT I would say that she looks a bit like a villain in that one I think? 5 is really good in that it feels heroic. Maybe something to do with how the mask kind of makes me think of power rangers or something. Also depending on backstory/culture information 1 could work really nicely, say if there was some cultural influences in the design, maybe Aztec or Native American, that sort of thing.
Anyway looking forward to more, good luck!