That's a tough question. There are many settings for fantasy stories/games and each has slight to major differences in the races that occupy it.
In general I would say Dwarves, because usually their culture is inspired on ancient Celtic or Germanic culture, and I'm really interested in both.
And I hold a love for outcasts from evil races, for example in the Forgotten Realms setting I instantly like all good-aligned Drow, Duergar or (Half-)Orcs. Individuals that overcome their society's inherent malice.
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