Honestly, that's the best fanart I've seen yet, and the most plausible after seeing the sketch of it's 2nd form. It's still not going to be Dragon-type, though. Right now, it looks pure Grass type imo, but I hope they don't leave it that way or it will be a Sceptile clone.Thats what I was thinking,something like this,but with no arms and legs.
http://browse.deviantart.com/?qh=§ion=&q=Tsutaja+evo#/d2t383c
Also, Water/Rock for the Otter's evo? Please, no. It's a horrible defensive typing and Rock makes no sense with the samurai idea either. Water/Fighting all the way.