Cherub

A cherub is a type of magical creature that, as far as can be determined, resembles a small, human child with angelic wings.

Description
Cherubs are mentioned only once, in Harry Potter and the Order of the Phoenix, where they are seen in Madam Puddifoot's Tea Shop. They are seen sprinkling pink confetti over the tables on Valentine's day, though their appearance is not remarked upon.

They are apparently either tamable, or are naturally helpful creatures, as Madam Puddifoot seemed to have employed them with enough confidence to have sufficient numbers under her single control. They do not seem particularly malicious or mischeivous, even though their confetti throwing did inconvenience Harry at least twice, it was likely by accident.