Arkhandus
First Post
Umm, no, Derulbaskul. Improved Natural Attack requires a natural weapon and a +4 Base Attack Bonus, while Superior Unarmed Strike requires Improved Unarmed Strike and a +3 Base Attack Bonus. Only monks (and swordsages who use the unarmed variant that gives them monkish unarmed strikes) have the ability to treat their unarmed strikes as natural weapons. So at minimum, you'd be looking at monk 1 (or swordsage 1)/fighter 5 or just straight-up monk 6, for example (Improved Natural Attack isn't a fighter or monk bonus feat option).
Monk or unarmed swordsage are probably best for a fistfighter, short of finding a suitable prestige class somewhere. A warblade with the right feats and 1 level of monk or unarmed-variant swordsage would also work.
Monk or unarmed swordsage are probably best for a fistfighter, short of finding a suitable prestige class somewhere. A warblade with the right feats and 1 level of monk or unarmed-variant swordsage would also work.