None of them are anything special, IMO. Nothing about their looks really scream "innovative" or "original". Chespin looks like a small Dewott, Froakie looks like what Palpitoad would evolve into if it was the first stage, and Fennekin looks like a Vulpix/Lillipup mix. I don't think any of them look bad by any means. I like them all, actually. I guess if I had to choose the most original one, it would be Froakie. I'm still going to pick Fennekin as my starter, though.