Mario and Zelda? That was one hell of a guess
Exclusive to the Wii U version of Scribblenauts Unlimited are characters and items from Mario and The Legend of Zelda, as shown above. But you already knew that, didn't you? Either way, the fun is in seeing these characters drawn in the Scribblenauts style, not necessarily the announcement of their inclusion. That Yoshi is so adorable.
According to 5th Cell and Warner Bros. Interactive Entertainment, Maxwell can summon the Nintendo crew and items, which should provide material for some funny YouTube videos. "Discovered Nintendo characters and objects will behave in the fun and fantastical ways they do in their respective game worlds." Mushrooms, anyone?
While this isn't the type of thing that will get me to run out and buy Scribblenauts Unlimited, I do love seeing these collaborations.