Since my summaries are so popular...
Trolls -- Hunch over and stomp their feet like sumo wrestlers before they attack.
Orcs -- Beat great drums before they go on a raid. These drums can be heard over a very long distance, making the villagers panic days in advance.
Goblins -- Insult humans in broken Common, make rude gestures, throw filth on them, etc. -- but only from out of reach. Break fences, steal livestock, etc. to extort cookies from human farmers.
Hobgoblins -- Goose step. Always march in order with magnificent battle standards and symbols of power. Shout a battle cry in unison before charging.
Gnolls -- Cackle eerily. Females dress like males, may be chieftains. Hate lions, even heraldric designs thereof.
Ogres -- Slam their clubs into the ground before battle (to challenge and scare the opponent). When charging, throw around stuff laying about (overturning tables, throwing pots and pans, etc.).
Minotaurs -- Throw their heads back, roaring in defiance. Before charging, scrape their hooves along the floor (like bulls). Chase their prey at leisure, their loud footsteps echoing through their mazelike lair -- since they dont have to rush; they already know where to turn.
Hill Giants -- Lick boulders before throwing them. Love to throw with their mates in waves. Wear multicoloured kilts. Clap their hands after hitting and holding up their fingers to give a rating of their throw.
Kobolds --
Never stand still (except when they're lying in ambush, of course). Even in melee combat, they're continually taking 5' steps at the very minimum.
Displacer Beasts -- Usually napping. Watch birds, squirrels, and other game. Try to scare off enemies after making a kill (to eat safely).
Giant Owls -- Eat Were-Rats and Ratmen. Regurgitate giant pellets (maybe with treasure). Always looking around -- turning their heads 180 degrees.
Treants -- (In tradition of Tolkien's Ents...) Live in geologic time. Speak slowly and laboriously, never succinctly. Remember ancient history.
Blink Dogs - Wag their tails before 'blinking'; like to stand on their hind legs; love to drive normal dogs crazy by blinking in and out.
Hags -- Offer tasty treats. Very maternal and sweet -- until upset. Hate beauty.
Celestials -- Speak in riddles. Only make formal declarations, no small talk. Look through people.
Centaurs -- Always talk in terms of astrology. View any suggestion of riding them as deserving death. Eat both horse and human food for their two stomachs.
Medusa -- Hire models to "pose for a statue", keep cages of mice to feed their hair, decorate their lair with real statues as well as victims.
Ettins -- Argue between heads. Play "good cop, bad cop" (if they parlay at all). Heads fight over food like two dogs.
Ratlings (Nezumi, Skaven, etc.) -- Always sniffing, especially in a new place. Gnaw on wooden objects (spear shafts, staves, etc.) when bored. Attracted to glittering objects.
Yuan-Ti -- Taste air with tongue. Stare -- without blinking -- at people. Bob their heads.
Troglodytes -- Move around a lot when angry or frightened; it helps spread the stench from their musk. If parlaying, attribute the most authority to the worst-smelling member of a group. Change skin color in order to express feelings.
Otyughs -- Willing to trade choice items from pile for disgusting pieces of trash. Cultivate fungi on self - such gardens often contain rare fungi unable to survive in the local area. Territorial but willing to share lair in symbiotic relationship (certain undead are a favorite as they tend not to consume their prey).
