Dwarf

Dwarfs are a short stocky people, little is known about them. On Valentine's Day in 1992[HP2], Hogwarts professor Gilderoy Lockhart, had a whole squad of Dwarfs dressed up as cupids deliver singing valentines around the school, one of which was delivered to Harry Potter from Ginny Weasley. The dwarf sat forced to sit on his lap and sang his Valentine Card. In 1993[HP3] Harry spotted a few raucous dwarfs in the Leaky Cauldron.

Behind the scenes
In the folklore of Germany and Scandinavia, dwarfs are a race of small supernatural beings who are known to be good with the axe and usually use axes to guard magnificent treasures buried deep inside the earth for who ever is ruling over them usually a queen. They usually look like small men with large heads, wizened faces, wearing animal (usually a sort of goat) masks, long grey beards, weapons as big as themselves, and misshappen legs and feet.