Rewards for completing the Challenge "Certificate of Achievement"

The Certificate of Achievement Challenge is my first "Impossible" Challenge! Now, I don't know what the best reward will be for completing this challenge, so I'm going to let YOU decide what you want! If you want to see the challenge, either 1, go to my profile and search for it, or 2, go to Mario Kart Cross Dimension! (But you only get the reward if you completed the challenge. Remember that I can check.)

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Maybe the reward could be a new character like a obscure one, I know this doesn’t fit but, but cranky kong is a cool guy, and it would be kind of funny to see him compete in a kart race. I know it would take time, but it’s an idea.