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Im terrible at linking but check out Super Genius Games Guide to the Talented Monk found here http://paizo.com/products/btpy9065?The-Genius-Guide-to-the-Talented-Monk
But the real art behind Yusuke's spirit gun is in the Guide to More Monk Talents found here http://paizo.com/products/btpy90lo?The-Genius-Guide-to-More-Monk-Talents
In that 2nd book there is an ability called Ki Bolt where the monk spends 1 ki point to turn a melee attack into a ranged attack and the range gets further and further as you progress simulating how Yusuke got more proficient with his "ki" as he got stronger, plus is all monk so hand to hand fighting with no armor is a plus. And since that one class covers all of Yusuke you are free to take really anything for the Yusuke package since your spirit gun and stuff is taken care of.