Tanis was typical, Drizzt was meant to be a one-of-a-kind.
If you mean that Drizzt is one-of-a-kind because of his characteristic traits, then yes. However he was not meant to be one of a kind as a non-evil drow. The realmsian drow are not the same as standard drow: when creating the Realms, Ed Greenwood envisioned this race having variety in ideas and cultures, he created non-standard drow for the setting, like Eilistraee and Vhaeraun, as integral parts of the world.
Also, to be honest, having an intelligent race willingly live a really ugly life, be all the same, with no one ever wanting anything different over millennia of history, except one super-dude (or a handful of them), sounds weird and far-fetched (and doesn't really reflect the origin of the race in the Realms).
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