From the Super Mario Wiki
The Shiverian Racer is a character who appears in Super Mario Odyssey. He is a Shiverian who appears in the Snow Kingdom inside a waiting room. He tells Mario that he does not want to compete in the Bound Bowl Grand Prix race because he is nervous and believes he does not stand a chance against the other racers. Unlike most Shiverians he does not wear a hat and he is shown with a small blue spike on his head. Mario is able to capture the racer so he can compete in two races on Snowline Circuit: "Snowline Circuit Class A" and "Snowline Circuit Class S".
He appears again post-game after breaking the Snow Kingdom's Moon Rock. This time, he appears outside of the waiting room and must once again be captured to win two different races on Iceburn Circuit: "Iceburn Circuit Class A" and "Iceburn Circuit Class S".
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