Fighting aside, what is Bob the goblins motivation to go running towards a bunch of well armed tin can suited adventurers that he knows are going to creme him? Why do the Kobolds risk life and limb to go after a shiny bauble they can't eat? What do they use them for? Is it a religious thing? Do they use them to impress mates?
How do undead see the world? Why are vampires such jerks? Is it a natural part of being a vampire, or are there some vampires who just ignore people. What about zombies? Do they eat flesh, or just hate the living? Could you command zombies to, say, dig ditches and build walls, or are they just good for eatin folk?
What about animals? You have to get a bear pretty riled up to attack a group of people. similarly, rats won't generally attack unless cornered. Why do animals decide that big, unfamiliar, noisy humans are good to eat?