The sole Dragon Quest character in Mario Sports Mix is a basic blue Slime. You may wonder, as did I, how does an armless blob play volleyball? The answer is he bounces balls on his head.
Slime’s style is "tricky", the same as Moogle and the black mage Kuroma. His special attack calls in three other slimes. They briefly form a tower before splitting up and ramming characters on the other team. That provides a perfect distraction for Slime to spike a ball into his opponent’s court.