Personally, I don't think lego's gonna do anything special with them :\ Even if they turn out to be undead (which is what it seems like), I doubt they'd make them reanimated toa, or even delve into their past histories at all. I mean look at the skulls spiders: They just suddenly appeared on Okoto. No backstory, no explanation... Unless we get an inkling from the books, it looks like they're just one of the random, faceless cardboard cut-outs that hero factory used :\