Halflings
Halflings, or simply 'flings are generally small, well-spirited people; that's how they've been portrayed in almost every single setting ever, and it'll probably stay that way. Still, when they're portrayed differently they tend to be rather . . . quirky. For instance, Dark Sun's halflings are all cannibals, while Eberron's are nomads that ride around on dinosaurs. Go figure.
Small, dodgy(stunty and right stuff), they generally favour rogue classes, though halfling paladins of Arvoreen are not to be underestimated! Halflings typically love food, beer and sex, the hedonistic little bastards. Adult female halflings are also known as legal lolis.
Halflings are really a shameless ripoff of Tolkien's Hobbits, who are also referred to as 'halflings' by humans.
Gallery
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4e halflings and their notable lack of hairy feet.