Clayman (クレイマン kureiman) was a Demon Lord Seed who was a member of the Ten Great Demon Lords. He is considered a ghastly man, infamous for his acts of manipulating his subordinates and others like dolls.
Clayman has an overall appearance of a wealthy noble. He has a slim, oblong head with a sharp chin and defined jawlines, having a pair of pointed ears on either side and his eyebrows are thin.
His getup involves a three-layered tuxedo, having an overall white color scheme.
When he puts his mask on and acts as the "Crazed Clown," he seems more like a mad beast instead.
Clayman is a cunning and manipulative Demon Lord. He prefers to manipulate things in the background rather than get into conflict himself. He specializes in intelligence gathering with the use of his ability in order to perfect his scheme to obtain more power.
Clayman treats his subordinates and those he considers below him very poorly. He would throw away those who are no longer useful to him and force others to submit using his unique skill.
As seen in his actions and noted by his creator and comrades, Clayman was noted to be quite arrogant and over confident in his abilities when things seem like their going according to his plan. As seen where he assumed that he had successfully mind controlled Milim despite her being infamous for being uncontrollable, assumed that Frey was his ally loyal to him alone and believed that he was powerful enough to overpower Rimuru and Shion due to becoming over confident at having gained "control" over Milim. This personality trait was noted by both Kazream and Laplace to be one of his most prevailing traits despite their warnings to him to adjust it.
Clayman was created by "Curse Lord, Kazaream as a walking dead many years ago to be part of the Moderate Harlequin Alliance, known as The Crazed Clown. Kazream himself personally designed Clayman to be a tactical commander and a schemer, similar to himself and created him for the expressed purpose of turning him into a Demon Lord.
300 years ago, He became one of the Ten Great Demon Lords with Kagali's help. The moment he became a Demon Lord, he began hunting down Majin and monsters to steal their hearts (literally). Making them swear loyalty to him, he inscribed a curse onto their hearts, making them his eternal servants.
After Kagali was defeated by Leon, Clayman hadn't received any words from him for a long time, until he met a mysterious patron who offered the resurrection of Kagali in exchange of Moderate Harlequin Alliance's help in taking over the world.
- Despite being killed during the events of Volume 6, his name was still often brought up in later volumes as a benchmark to describe the strength/magicule amount of new characters. The author jokingly mentioned that Clayman effectively became a "combat strength measurement unit".
- His VA in anime, Takehito Koyasu, is well known for playing twisted and manipulative evil masterminds, such as Dio Brando in JoJo and Sugo Nobuyuki in Sword Art Online. Needless to say, this is very fitting for Clayman's character.
- LN Vol 5, Chapter 3.
- LN Vol 3, Chapter 4.
- LN Vol 6, Chapter 5.
- LN Vol 3, Prologue.