Not quite sure about emmet's minion (knows just about nothing about starhawk) but for Kat I could definitely see Raven, or maybe Alias even. Probably not Dusty, seeing as he's already part of Kat as a character, but hey, there is both a sackbot item and sackbot minion, so it's possible
Do you play LBP2? If so, could you take the time to check out my levels?
Check out my LBP.ME
Emmett without a doubt will have cutter, as i strongly believe Logan Graves(His outcast brother) will be one of his alts. Kat will most likely have Raven but also possibly Yunica or Alias.