Kotaro Fuma is a ninja serving under the Hojo clan. He kills anyone he sees in his eyes becoming a legend. In the Sengoku Basara games, he serves both Hojo and Matsunaga. Under Matsunaga, he tries to kill Kojuro Katakura but fails. In Sengoku Basara 3, he takes to commanding the Hojo forces in the field while his commander Ujimasa hides in his camp.
Role in Super Smash Sisters
Kotaro appears in Super Smash Sisters as a non-playable character. He can help out the female characters in battle with his ninjatou and even sometimes use his Sengoku Basara skills. He is still mute. When talked to in CG cutscenes, he just shows cards to communicate with the girls.