Like piranha, but meaner. If a target is swarmed, don't attack for each individually; instead do 1 damage per 4 fish. Instinct: to feast

• Nibble painfully
• Swarm around a bleeding target

These fishers aren't eager to fight, but will if they have to. Some of them won't be as friendly (check the disposition of the nearest settlement). Instinct: to feast and be joyous

• Offer a share of the catch in return for help
• Sound the warning horn

A massive fish, large enough to eat people. It's not really aggressive, though. It's stomach has 8 hit points but heals rapidly. Instinct: to remain undisturbed

• Swallow Whole

A massive snake, large enough to swallow people whole. It's stomach has 10 hit points, 2 armor, and does 1d4 acid damage + poison. Instinct: to devour meat

• Swallow someone whole
• Spit venomous acid

An ordinary enough snake. Instinct: to be left alone

• Bite with venom
• Appear or disappear suddenly
• Lead back to the nest

A hunter from a nearby community. Friendly and welcoming to strangers - if the strangers are friendly themselves. Instinct: to provide for their community

• Offer a meal and shelter
• Appear or disappear from the wilderness
• Return home

A criminal, runaway, eccentric, or witch; looking to be left in peace. Witches might offer a ritual, blessing, or concoction. Instinct: to avoid attention

• Flee or hide
• Offer promises or minor goods in return for being left alone

All dragons are selfish and egocentric. Some are just nicer than others... Instinct: to feel superior

• Play with them
• offer a deal or quest
• use magic appropriate to it's color
• breath a terrible weapon

An ogre, blessed with inborn magic. Still pretty nasty, though. Instinct: to turn people to soup

• Smash something to bits
• cast sleep, magic missile, darkness, or flight

A massive hulk of a man-thing. Instinct: to turn people to soup

• Smash something to pieces