Sorry if it's nitpicky, but he looks so weird without one, like a balloon, or like he's unbalanced and is about to topple over. I always felt like visual design is important in Smash, and to me, this makes him look really unappealing and undesirable to play as. And confusingly, the K. Rool Mii costume in Smash 4 had a tail, but not this version of him.