Soundwave on 31 March 2012
I think the 3DS version will set the table and probably sell under the radar for a while, but a Wii U sequel is where it could really take off.
Honestly Nintendo should think about making this into an anime/cartoon series + toy line for kids on top of the games. That would really increase its profile and the IP is tailor made for that.
Despite the learning curve on the controls (use the stand people! It's there for a reason), I think this is my favorite game of the year so far and edging ever so close to Super Mario 3D Land as the best 3DS game. It's so freaking charming and fresh.
