I think the title is plain enough, they shouldn't be human.
Why you may ask?
Your current reputations:
Human : hate
Changing the race of the creatures in Elemental canyon from Human to something else.
That must be annoying 
Edited
Uhh... Find a better place to train? Unless something has changed it takes A HUGE effort to get reputation all the way to hate. You must have killed the entire canyon over 100 times!
For some classes the Canyon is an ideal place to train certain skills.. but everything comes with a price! 
Reputation goes back to normal after a time.
Doesn't take that many kills.
Reputation is a useless system as is. It's a very interesting concept, but I honestly think that it takes too much to actualy have any consequences.
I think it would be an idea to explore with the whole 'rumor' idea that floated around a while ago. Give it to Heralds. And if someone pisses off or tries to kill a Herald they can spread a rumor around humans or undead or faerie or whatever, putting a big hit on their reputation and having those races attack on sight.