Benmaru  

Mochizuki Rokurou, 望月六郎 (弁丸)

A young boy who encounters Saizo and his companions during their travels. Although he's quite young, his proficiency in fireworks and traps impresses even adults, and he's searching for a lord worthy of serving. His true name is Mochizuki Rokuro, but Yukimura renames him Benmaru (which is Yukimuras second name) to differentiate him from Unno Rokuro.