Kakashi can be considered one: he is the smartest shinobi in the world. I can think of only Kakashi because the Naruto world has a lot of simple characters almost. There aren't many grey characters in it to call them scoundrels.

Kabuto can be a scoundrel, but he chose the dark side mostly.



Itachi also fits the bill pretty much. SO I guess Itachi and Kakashi could be scoundrels.