Skating Shy Guy
From the Super Mario Wiki
Skating Shy Guys are Shy Guys that appear in Sherbet Land, which first appears in Mario Kart: Double Dash!! and later in Mario Kart 8 and Mario Kart 8 Deluxe as a retro course. The Skating Shy Guys skate around the course on ice skates and occasionally twirl into the air. They also serve as obstacles for the racers, slowing them down if they hit them.
They come in blue and red varieties; the blue ones skate by themselves, while the red ones skate together holding hands.