It's quite easy to not use units. I never touched Leonardo, Aran, or Ilyana. Now I'm on the endgame of part one and they're all second tier. It's pretty cool except that they all have crappy speed. I've grown to like Leonardo and Aran, I'll probably use them again in the future now. Ilyana probably not. I'll never use Meg either, I always ditch her. Also Fiona, no thanks.
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~Halo Now darkness takes you... forever.