I think Kentarou might have been thinking on the side of 'one who is rolled/Noby'd up'. I'd gather that the Katamari one would be more frightful, because if the Prince rolls a bigger star than the one you're on, then *poof*.

At least in Noby Noby Boy, you get pooped back out eventually. If you're lucky and Boy eats an animal or a fruit after you, you might get transformed into something new!

Noby Noby Boy is a crazy game. Pretty fun to just watch weird things happen and be confused the whole time. Traveling to other planets is cool.