Scarlet flame of darkness. The youngest of the Shiba brothers. Having outstanding talent since young, he is single-handedly commuting the will of the sealed dark god of war Shu. He is taken into the body of Ankoku Gyokuji Psycho Gundam when it awoke.

It is noted in the manga version, that Shiba-En addressed Shiba-i as father, where in the Chinese literature, Sima Yi is Sima Yan's grandfather.