クラウス

A former Suima noble turned into a human by angelic technology. He retains some of his former powers, but his new human frame is largely incompatible with his previous form which is a frequent source of frustration for him. When he does activate his powers, his right eye turns red. 

He reacts to news of the Demon King's unexpected death as an opportunity to start his quest for revenge against the Angels who transformed him and to stake his claim as the new Demon King. 

 Many of his foes underestimate him because of his outward human appearance, however the magical energy he emanates is no different from other demons. He is unable to hold on to the element of surprise for long, but he's well aware that his frailties as a human force him to rely heavily on Helmina to seduce more opponents to his will. 

He is well-versed in the sex magic which all Suima are inherently gifted in, so any female units taken prisoner can be bent to his will when he rapes them. The only exceptions are other Suima are Helmina and Elvire.

Although he ultimately finds and defeats the one responsible for his transformation, he cannot reverse the process as he lacks the necessary catalyst and information on the internal workings of the device that changed him. Nevertheless his ambition does not end as he turns his attention towards the other compe*****s for the Demon throne. /