Since my summaries are still 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. Assume females are leaders of any group. Hate lions, even heraldric designs thereof. Often color or braid their manes to show off rank or clan (e.g. three bright yellow "tails" in the mane for Clan Tallowfang).
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).
