Kind of the same here. They both originated from feywild goblins which are neither. Long ago when the feywild goblins emigrated to Midgard they split into two groups, one following the wicked and hurtful trickery path and the other the light hearted fun trickery path.IMC gnomes are goblins, and vice versa. Both sides deny it, but it's true nonetheless.
In terms of niche, like elves, gnomes came from the Feywild back in their prehistory. But where elves have an affinity with trees - tall, straight, and mighty, gnomes are much more associated with fungi and the other, more mutable, life of the forest.
But for the OP I'm afraid my gnomes would be boring. Most lean in to being inventive creative types, always trying to outdo each other in their competitions. It doesn't really matter if it's illusion magic or mechanical invention, always pushing limits in search of improvements. This is both beneficial because sometimes things really do work, other times they just end up breaking things that worked just fine.
Forest gnomes are more likely to play pranks and practical jokes and specialize in illusionary magic that blends in to their surround environment.
Individual gnomes of course are free to go their own path, but without some racial tendencies and tropes, I don't see a lot of reason to have multiple races in the first place.