Hey, so I couldn't see an answer to this question anywhere so I thought I'd ask it. What happens if a character gets range 0 (by Seth's Fool's style, for example)? Does he hit himself or does the attack simply miss? Along those same lines, can a character damage himself at all (i.e., Khadath standing around his own Gate Trap during a Snare attack)?
No, a character cannot attack themselves. Range 0 allows you to attack an opponent in the same space you are attacking from. This is useless for characters, but for markers (like Juto or Jager) it can be useful to hit a target in the same space as the marker.