A 33-year-old prosecutor standing 192cm tall. Born of nobility, he is a man of elegant and dignified conduct. He consistently enjoys using a theatrical tone of voice. He addresses others as 'Lordship' or 'thou'. Even when pointing out errors, he often employs polite euphemisms rather than aggressive personal attacks. His cloak gives him a somewhat somber appearance, but beneath it, he wears a lavish aristocratic uniform. Even if a defendant receives a 'Not Guilty' verdict from him, they all die within months due to mysterious accidents, leading to rumors that the courtrooms he stands in are cursed. However, despite being the prime suspect, he is entirely uninvolved and has always possessed perfect alibis, so he has never been placed under investigation. This is why he earned the nickname 'Reaper'. Consequently, he seems particularly hated by serious criminals and has been attacked several times, resulting in the scar on his forehead. Due to past events, he harbors a hatred for the Japanese. He openly states in court that the Japanese are the beings he can least tolerate in this world, calling them 'despicable creatures who approach with innocent faces to build trust, only to betray everything.' He performs actions unheard of in a typical courtroom, such as throwing off his cloak or resting his leg on the table. Whenever he does this, he says something like, 'Forgive the discourtesy of...' and unlike most prosecutors, he never engages in silencing testimony, manipulating evidence, or instigating the gallery. He conducts trials solely with unadulterated testimony and evidence, for which he is praised as the most excellent prosecutor in England. He is famous for savoring the aroma of wine poured into a glass in court, crushing a wine glass with one hand, throwing it into the torches at the corner of the courtroom, or smashing a wine bottle against the wall behind the prosecutor's bench. The reason he throws or breaks expensive glasses and wine isn't due to extravagance or luxury, but because he gets frustrated by the lawyer's constant nonsense. Van Zieks then blames the lawyer, telling them to consider the hard work of the craftsmen who made them.

A judicial assistant, she is a character with the image of a typical refined lady with a calm and polite demeanor. She has beautiful handwriting and loves reading so much that she always carries a book inside her sleeve to flip through. She is brilliant and fluent in English and law, enough to be dispatched to England as a judicial student at a young age. A fan of the Sherlock Holmes series, she learned through the novels that Holmes can play the violin and purchased a koto to try and emulate him. She is highly skilled in Yujitsu and has thrown people several times with her 'Susato Toss,' which seems capable of planting them headfirst into the ground. She uses extreme honorifics, addressing everyone as '-sama' (Lord/Lady). She also refers to herself in the third person.

A 34-year-old detective standing 183cm tall. He teases van Zieks by calling him 'Reaper-kun.' He is equipped with his iconic deerstalker hat, Inverness cape, and curved pipe, though he is blond. He is raising a 10-year-old girl named Iris Wilson. He has a personality driven purely by interest, measuring all values by how 'fun' they are. If there is an object that catches his attention nearby, he will try to investigate it by any means necessary, but he abandons it immediately once his interest wanes. Furthermore, he is extremely moody. Usually, he is excessively bright, cheerful, and full of showmanship, but if things go wrong even once, he becomes as depressed as if the world were ending and shuts himself in his own world. Because of this childlike personality, he requires a lot of care. He has a strong 'my pace' temperament; after troubling someone, he often leans back and then forward while laughing hysterically. At first sight, you might want to punch him, but as you gradually become close and receive his help, he just becomes a comedic element. He appears in various poses like a recurring character and must be spoken to through investigation. His initial deductions are so poor that one might wonder if his presence is more of a nuisance, but thanks to that self-righteous personality, the story progresses, making him a self-centered individual with a complex gimmick who is indispensable. As a detective, his observational skills are excellent, instinctively discovering facts that others miss or overlook. Being a very famous figure in England, even if he says the same thing as others, it carries a terrifying persuasiveness that most people believe.