Clayman

Species: Deathman (Deathman)

A member of the Moderate Harlequins, known as the Crazy Clown (Crazy Clown), and one of the former Demon Lords, a Puppet Master (Marionette Master). Born in the same hometown as Kazaream, he was created from a corpse by Kazaream to never forget the humiliation of their hometown's destruction, and was reborn as a Deathman. He became a Demon Lord about 300 years ago, and after Kazaream was killed 200 years ago, he took over his territory. He trusts no one, treating even his subordinates, known as the "Five Fingers," coldly, but he is friendly towards his original companions in the Moderate Harlequins, especially devoted to Kazaream, who is like a parent to him.

He excels in scheming and commanding his forces, but is not good at combat. He specializes in mental magic and uses the Unique Skill "Puppeteer" to gather information through the eyes and ears of his subordinates. Among the Ten Great Demon Lords, he possesses the most wealth, knows how to use money, trades with the Eastern Empire and the Dwarf Kingdom, equips his subordinates with the latest weapons and armor, and enhances their strength with ancient relics and magical devices. He also spreads the profits from trade and uses manipulation to his advantage.

He plans to control Milim with the Orb of Domination given by "that person," but loses his caution when Milim pretends to be controlled, thinking he has gained her power. His awakening as a true Demon Lord leads him to incite the Kingdom of Falmuth and secretly expand the damage to Tempest through Myulan, angering Rimuru. He manipulates Milim to destroy Eurazania, seizes weaknesses to take a high-handed attitude, turning Carrion and Frey against him as well. His repeated failures lead to desperation, ignoring his companions' advice and secretly planning another invasion of Eurazania and Tempest during the "Banquet of the Demon Lords," but his forces are destroyed by the allied forces of Tempest and Eurazania led by Benimaru, and his base falls to Shuna and others. At the "Banquet of the Demon Lords," he attempts to dispose of Rimuru with false testimony but is overwhelmed by Shion, who owns a weapon with a mental attack effect and can nullify mental attacks, and is cornered when he realizes he has been deceived by Milim and others. He attempts a last-ditch revival through incomplete awakening at the banquet, but is completely absorbed and annihilated by Rimuru's "King of Gluttony."

In fact, he had been under mental control by Kondo for decades, which occasionally caused him to go berserk. Kondo was also controlled by Michael and Feldway, so Kagari and others recognize Michael and Feldway as Clayman's enemies.

In the spin-off manga "That Time I Got Reincarnated as a Slime: Clayman REVENGE," he becomes the protagonist, starting the story from the moment he was annihilated by Rimuru, time-leaping back 70 years. Due to the effects of the time leap, Michael's control is gone, allowing him to objectively analyze his past actions, especially questioning why he could have been so cruel to Myulan, initially intending to return her heart once she fulfilled her role. Learning from these past mistakes, he revisits how he builds relationships with his subordinates, becoming beloved by them, though he becomes troubled by their overly free actions.