Virg (atys)
Eventually with the right gear and levels etc you can solo any normal mob- even a KP. Most high level nameds you won't be able to solo (but there are some you can). Any 220 or 270 boss is out of the question as well- maybe 170 but never tried.
I can't speak for other 170s, but I know Kincherkan pretty much requires a healer, a nuker, and a tank. Pretty easy to take down if you have all three, but hits hard enough that a nuker cannot survive long solo, has enough HP that melee would take forever even if he didn't hit back, and there is no way to take him down before running out of HP, sap, and/or stamina.
I suppose that proper use of enchants and a pile of crystals could remove the need for the tank, but the healer is still required due to the sheer HP.
Also, there are a few "normal" mobs I wouldn't try soloing. Plods and Shalahs come to mind immediately.
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