Okay. Yoshi, Kirby, and Pac-Man are 10 paces away from each other. None of them have eaten anything for the past two days. Smash Bros.-style health, and they're all at 100%.
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START!
Pac-Man is taken out of the competition immediately when he runs straight into the area at which Kirby is sucking. While Kirby is swallowing Pac-Man, Yoshi eats Kirby. Yoshi wins!
However, if you want an eating contest involving food, Kirby would probably tie with Yoshi, because Yoshi's tongue is faster, but Kirby can inhale more at once. Pac-Man wouldn't even stand a chance unless the contest took place inside a maze full of dots.