Okay, I just got through the character options (pretty comprehensive there, so well done on that) and a couple of things I thought I might mention: First, Vortixx have the Shadow element,-according to the Bionicle Encyclopedia, page 93 in Roodaka's entry if you want to check my source.
Second, I just did a stat line for a Vortixx and even with the limit of no more than 20 attribute points added to each thing before bonuses, I'm still looking at mostly fifties and if you're working with on the average forty principle, then you're looking at more successes than anything else.
Maybe consider substituting Dark Heresy or Warhammer Fantasy Roleplay's version of the stat line?
Something to consider for the sake of what sort of power level you envisage for the came.
Dark Heresy and Warhammer Fantasy, your characters don't start out as powerful, which adds an element of drama and discourages making stupid moves.
That might just be my personal preference talking though, so feel free to ignore that bit of diatribe.
On a completely different note, is an RP being planned or what's going on there?
I saw the idea suggested, but nothing concrete.