Kosuke Yabuki was recently quizzed on whether Nintendo would ever consider opening up Mario Kart to other characters.
In an interview with the producer of Mario Kart 8 this week, he was asked whether he would ever be "tempted to take the Super Smash Bros. approach and include characters from outside of the Super Mario universe".
Whilst the core experience strictly has been characters from within the universe, plus the addition of a few Nintendo folk like Donkey Kong and ROB, Yabuki is "not ruling out the possibility of such an approach in the future."
He doesn't believe that simply "increasing the number of characters would make the game better", however, and that the team need more ways to make the series more appealing in each release.
Would you like to see non-Mario characters in Mario Kart - should Nintendo develop a Nintendo Kart/Super Smash Kart?