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Seb-wejem
I did create a rough setting idea a long time ago that I never got around to running so I never thought about monsters that would be in it. It was a tribal society of humans, limiting the player race choice to human only. As they venture out from their homeland they'd likely find a few more races, halflings were already known and traded with.
I only know for sure that beasts would be in the game, but I'd also keep at the very least wyverns (I like them as a low to mid level threat, don't know why) and other monstrous creatures might also exist, perhaps as unique creatures like the hydra or Nemean lion. It might not be a setting for high level play so I'm not sure what else I'd really throw in, probably beastmen (orcs, hobgoblins, bugbears, etc) as some sort of opposition.
Another setting I created had humans migrating in from the south, invading the lands of the elves who retreated to their forests while leaving the plains for the humans. In the northern mountains, dwarves started to expand and ran into a burgeoning goblin/hobgoblin empire (hobgoblins being an evolved version of goblins altered by a shaman who found a source of power). Dragons were individuals and ancient, you would be unlikely to find anything other than an ancient dragon.
This limited the player races to elves, dwarves, half-elves, and humans. Goblins and hobgoblins were an enemy empire trying to expand into the territory of the humans kingdoms. There were no orcs (and therefore, no half-orcs), gnomes, halflings, or dragonborn available in the setting as they flat-out didn't exist. Still no idea of what creatures I'd have in the game though.
Normally, I come up with what's in a setting as I need them. My current game I know there was a great war between giants, dragons, and elementals so I've kept in any creatures/races that are related to the three of them.
I only know for sure that beasts would be in the game, but I'd also keep at the very least wyverns (I like them as a low to mid level threat, don't know why) and other monstrous creatures might also exist, perhaps as unique creatures like the hydra or Nemean lion. It might not be a setting for high level play so I'm not sure what else I'd really throw in, probably beastmen (orcs, hobgoblins, bugbears, etc) as some sort of opposition.
Another setting I created had humans migrating in from the south, invading the lands of the elves who retreated to their forests while leaving the plains for the humans. In the northern mountains, dwarves started to expand and ran into a burgeoning goblin/hobgoblin empire (hobgoblins being an evolved version of goblins altered by a shaman who found a source of power). Dragons were individuals and ancient, you would be unlikely to find anything other than an ancient dragon.
This limited the player races to elves, dwarves, half-elves, and humans. Goblins and hobgoblins were an enemy empire trying to expand into the territory of the humans kingdoms. There were no orcs (and therefore, no half-orcs), gnomes, halflings, or dragonborn available in the setting as they flat-out didn't exist. Still no idea of what creatures I'd have in the game though.
Normally, I come up with what's in a setting as I need them. My current game I know there was a great war between giants, dragons, and elementals so I've kept in any creatures/races that are related to the three of them.