Re: Ditto - I actually really, really like idea, but there's one problem - if you'd have only 2 skills, how will the leveling go? (Since it's a pretty powerful race, it should have at least 24 levels as otherwise it's a sick xp farmer). Other than that, I really like the concept of ditto and the possibilities it gives.
Re: Chameleon - what Spasm said is that it's like Chameleon should be... And I would vote for that (not that I can) if that would be possible.