As far as I remember the rule, it was "one unique, customizable minion/cohort", or "legions of identical minions". So Kunoichi had her Studmuffin elemental, but no other minions. I have/had my Storm Elementals, but they all had to be identical (Psudonatural) - my Black Wyrms had to all have the Evil Arch-Dragon template, I couldn't give half of them Evil Arch-Dragon and half Chaotic Arch-Dragon.