akimitsu-dono
A minor character appearing in Fate/Grand Order. A component of Ashiya Douman's spirit origin as an Alter Ego servant, known as the Evil Spirit Left Minister (Akuryou-safu). He materializes him as a vengeful spirit when using his Noble Phantasm, where he appears as a black skeleton.
His true name is Fujiwara no Akimitsu, Fujiwara no Michinaga's son.