From the Super Mario Wiki, the Mario encyclopedia
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Cyrrus is a newborn cloud in Super Paper Mario in The Overthere. His name comes from the given name Cyrus and from a type of long, thin cloud known as the "cirrus" (even though he more closely resembles a stratocumulus cloud). Tippi even mistakenly refers to him as "Cirrus" when tattling him right after meeting him.
If the player brings him a Red Apple, he will grow large enough so that any character that jumps on him will bounce all the way into orbit before falling back down to a cloud above him, though if the player gives him any other apple, he will get the same side effects as Peach whilst sleeping.