|Appears in:||Fate/Grand Order|
Sukeroku is an oni residing in a dream-like world. He was originally a swordsman in Musashi's original world, having faced her shortly after she left her village. She slayed him, and his grudges turned him into an oni.
Sukeroku appears as a cowardly oni in Musashi's trial quest, eventually regaining his memories. He attempts to kill her again, but is defeated.