Ways to make your fantasy races different:
1) Elves: BORED. They don't bother to play games as adults and only dedicated elves bother with music, art, or other crafts. They spent 40 years as 'Kids' playing every variation of Hide and Seek, and 60 years as 'Teenagers' doing every variation of Poker. They've been listening to music for hundreds of years and when a song gets stuck in their heads it takes months to get it out so they mostly just don't bother. "Yes, I spent 60 years mastering Sculpture but after doing it for -so long- you start to notice the marble all looks the same." Elves don't really do anything with their downtime except sit round vegetating unless some human or something -drags- them off to do an activity which they invariably excel at because of having done it TO DEATH 20 years ago. However, every new Fad gets them SO EXCITED until they burn out on it, too.
2) Dwarves: Constantly annoyed. Like so annoyed. The sun is too bright the streets are too busy, there's too much -color- everywhere and all the food is bland as paper. Dwarves evolved underground in the quiet places of the earth with the sound of hammers and chisels ringing out. Their beards are long and thicker than any human hair because they're evolved to catch rock-dust and keep dwarves from breathing it in. Which makes human foods smell -dull- because Dwarf Food needs to be spiced to hell and back for them to be able to smell it fully for their tastebuds to engage. Plus human spices are all weak baby stuff compared to the poisons dwarves use in their food. Oh, sure, we use capsaicin and other -mild- poisons, but dwarves season their food with arsenic and cinnabar. UGH. The surface world is such a disappointment in every way.
3) Halflings: Quiet. TOO quiet. When you're a tiny mammal living in a forest with massive predators you tend to be light-footed and tight lipped. Others are unnerved at your tendency to stare at them because halflings mostly communicate through facial expressions and body language which tends to not attract tigers and ankhegs quite as much as talking or dancing. At least in public spaces. Within the safety of a building where walls and ceiling protect you from giant owls and boogles of giant weasels, they're -able- to be loud and capricious and let out all the pent up nerves they've been fighting with all day. Never put a halfling in a jail cell, keep them in open air prisons or they'll talk your ear off!