User blog comment:FinalFlash18/Killua's assassin mode or Gon's beast mode/@comment-48285-20140113163604

I'm gonna go with Assassin Mode because Killua has control over it and it isn't triggered by any emotions. Gon's "Beast Mode", as you call it (which is a nice name), is too unpredicatable and is triggered by pure rage. Plus, I don't like where it puts Gon afterwards.