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Wheelchair Koopa is a minor character in the SMG4verse, which he debuted in The Mario Hustle.
Wheelchair Koopa makes his debut with Bob offering his Rocks in exchange for cash. The former declined, resulting in the Garo telling him that they will cure his broken legs. The Koopa excitedly asked if this was true, resulting in Bob quickly making up a fake chant. The Koopa then decided to walk a few steps, resulting in him crashing to the ground unconscious. Bob then told him that he needed to purchase the advanced DLC for $500 plus a $60 monthly subscription. Since the Koopa Troopa did not reply, Bob proceeded to take his money and left the rock there before leaving him be.
He later appeared in this episode as Mario and Wario's second scam victim. Wario, pretending to be a magician, ordered the Koopa to close his eyes while Mario used a magnet to grab the Koopa's wheelchair. Unfortunately, the wheelchair knocked Mario and it into the street, where it was run over by a car and set on fire. However, the Koopa did not seem to mind, believing it was all part of the show, and Wario left.
SMG4 and Mario compete to see who can outrace each other on a Rainbow Road course, all while beating Wheelchair Koopa along the way. Naturally, SMG4 and Mario took an enormous lead over the minion, resulting in the Italians repeatedly trying to best each other, be it attacking each other or upgrading their vehicles. Eventually, they flew off course and both exploded, while the Koopa fell unconscious on the course, resulting in a three-way tie as a result.