The Zombie variant of Leggsy. He appears to be a Leggsy with purple hair that covers up most of his head, sporting a white bandana and purple shoes. Unlike Leggsy and his legless variants, Dead Donny Dash attacks by flinging his shoe into the air, which then expands and comes crashing down. In practice, he behaves less like Leggsy and more like a faster Tackey with Zombie attributes and a smaller blind spot.
He's a lot faster than Tackey, so you can let him burrow, get close, and use cats like Awakened Bahamut Cat or Maglev Cat to enter his range and destroy him with ease.
He may be a reference to Kitarō, the titular protagonist of GeGeGe no Kitarō. They both come from the grave, their hairstyles are almost identical, the GeGeGe no Kitarō opening theme mentions "sports festivals in the graveyard at night", and Donny's first name in Japanese is Shitarō, swapping ki (鬼) with shi (死), meaning "death".