Daimyo Akechi appears in The Ring of Earth.
The Ring of Earth
He is a samurai lord and has a strong, obsessive hatred of the ninja. His main aim is to wipe all ninja clans off the face of the earth. Because his father was killed by ninja, he wants to exact revenge on all of them.
At the end of The Ring of Earth, he is killed after trying to disguise himself as a ninja. Jack catches him out by saying the secret ninja password: "A sparrow never lands where the tiger roams" (the secret password of Shonin's Clan). Akechi didn't know about it, and thus revealed himself. He tries to stab Shonin but is killed by Zenjubo, who twists the knife into Akechi's body.