Suguro

is a thief that was part of Jakō's gang.

Konoha History Arc
He is the first of the thieves to find and attack Naruto Uzumaki and Sasuke Uchiha after they were linked together by Jakō's Chakra Liquid technique, when Naruto wanted to pee and Sasuke refused to go with him (as they were both linked). They started arguing when they came across Suguro who was apparently himself peeing. He quickly dashed towards them and attacked them with his Manriki-gusari, but was later defeated by both of them.