I was just watching STOked 78 and they mentioned the rule about the use of canon characters, namely: don't do it!
But I was wondering. What is the definition of a 'canon character'? I mean Spock, Kirk, Picard, Data and Janeway are obviously canon, but what about... a character like: Hoex (see: http://memory-alpha.org/wiki/Hoex). Is that allowed?