Blue Seven is a long blue kart. It looks similar to that of Luigi's Streamliner with both of these karts being blue with a white stripe going across in middle vertically. At the back, there is a yellow spoiler with black stripe and black 7. In the front, there is a black bumper on the bottom with two yellow headlights. It has a squarish little windshield.
Among the fastest karts, Blue Seven is the only not to have a negative in the sea.