Ichiji is the oldest brother in the set of Quadruplets Vinsmoke Sora had, his brothers being Niji, Sanji and Yonji while his eldest sister is Reiju. Since birth, Ichiji has lacked the ability to feel empathy and sympathy, due to the genetic modifications performed on him by his father. Despite this there are very rare times where he expressed gratitude to those who've saved him. Nonetheless, hes apathetic and brutal.